Tests: set expected stage to »PASSED« when not comparing output and expect=DIFF

Tests: if no numdiff executable is found fall back to running tests instead of dropping

Merge pull request #11066 from bangerth/fesys

Use operator^ to create FESystem objects in the tutorials.

Merge pull request #15445 from tamiko/fix_use_after_scope

TriaIterator: return a proper Accessor temporary

Merge pull request #15635 from bergbauer/n_lanes

FEEvaluation: Use n_lanes class variable

Merge pull request #15636 from tamiko/silence_a_warning

base/exceptions.h: avoid warnings in Trilinos / Kokkos headers

Merge pull request #15637 from bangerth/vsv-concept

Create a vector space vector concept.

Merge pull request #15639 from bangerth/affine-constraints-9

Remove a funny exit path in AffineConstraints::close().

Merge pull request #15640 from bangerth/brace

Use balanced braces for doxygen formulas.

Merge pull request #15642 from tamiko/fix_test_33

Test fe/fe_enriched_step-36: make a test less expensive

Merge pull request #15645 from lethe-cfd/step68_point_eval

Change step-68 + timing_step-68 to use FEPointEvaluator

Merge pull request #15401 from masterleinad/cppcheck_9_5

[Post-9.5] Address some cppcheck findings

Merge pull request #12080 from bangerth/check-for-directory

[C++17] Check whether the output directory exists.

Merge pull request #15608 from peterrum/tria_orientation_

Introduce tria_orientation.h

Merge pull request #15615 from pcafrica/generalize_triangulation_save

Move the save and load function to serial tria

Merge pull request #15620 from bangerth/micro-opt

Micro-optimize a loop.

Indent

Merge pull request #15629 from masterleinad/fix_remaining_deprecations

Remove remaining deprecations

Merge pull request #15631 from bangerth/vsv-trilinos-tpetra

Get rid of VectorSpaceVector in the LinearAlgebra::TpetraWrappers::Vector class.

Modify performance test to use FEPointEvaluator

Update step-68 to use FEPointEvaluation

Merge pull request #15621 from tamiko/fix_cmake_caching_03

CMake: record git information in a separate configuration file

Merge pull request #15561 from bangerth/affine-constraints-6

Parallelize some operations in AffineConstraints::close().

Merge pull request #15560 from tjhei/test-steps

Test example steps directly

Use n_lanes class variable

Use operator^ to create FESystem objects in the tutorials.

Check whether the output directory exists.

Test fe/fe_enriched_step-36: make a test less expensive

The debug variant of fe/fe_enriched_step-36 takes about 6 minute to
execute with clang and -fsanitize=address. Let's make it a bit less
expensive.

Merge pull request #15527 from bergbauer/fix_ecl

FEFaceEvaluation: Fix ECL for continuous elements

Use balanced braces for doxygen formulas.

Merge pull request #15632 from bangerth/virtual

Mark a 'virtual' function as such.

Remove a funny exit path in AffineConstraints::close().

Fix documentation

Merge pull request #15618 from bangerth/fold

Use C++17-style fold expressions.

Check vector-space-vector concepts for all vector classes.

Merge pull request #15625 from drwells/update-reordering-module

Significantly expand the orientation module.

Merge pull request #15609 from bangerth/typename

Standardize on 'template <typename X>.

TriaIterator: return a proper Accessor temporary

Merge pull request #15614 from bangerth/loop-tria

Fix range-based for loops over the cells of triangulations.

Merge pull request #15617 from tamiko/fix_cmake_caching_02

CMake: avoid updating deal.II{Config,Targets}.cmake when nothing changed

Use a simpler scheme to determine whether a DoFHandler uses hp features.

Mov reorder_old_to_new_style to tests/test_grids.h

Merge pull request #15589 from masterleinad/remove_deprecated_matrix_free_evaluation

Remove deprecated MatrixFree::FE[Face]::Evaluation functions taking bools

Merge pull request #15600 from tamiko/fix_scalapack

lac/scalapack.cc: fix an out-of-bounds write that leads to a double free

Merge pull request #15601 from tamiko/fix_petsc_test

Test petsc/petsc_ts_05: avoid stack-use-after-return

Merge pull request #15630 from tamiko/dont_run_on_drafts

github: do not run checks on drafts

github: trigger on ready_for_review event

github: do not run checks on drafts

Create a vector space vector concept.

Change log entry

Remove deprecated Triangulation::create_triangulation_compatibility

Remove deprecated PETScWrappers::PreconditionerBase alias

Remove deprecated GridTools::cell_measure overload

Fix comment for GridTools::consistently_order_cells

Remove MappingQCache initialize

Remove deprecated LinearAlgebra::CommunicationPatternBase

Remove deprecated TriaAccessor::number_of_children()

Fix tests

Merge pull request #15616 from drwells/more-17-updates

Update the documentation in a few places to refer to C++17.

Merge pull request #15613 from tamiko/fix_cmake_caching_01

CMake: fix caching of C++ language feature checks

Merge pull request #15612 from tamiko/fix_compilation_with_trilinos_12.14

lac/trilinos_tpetra...h: Fix compilation on Ubuntu 20.04

Fix more tests

base/exceptions.h: avoid warnings in Trilinos / Kokkos headers

gcc might emit a warning depending on inlining and optimization, even
though we include the header in question with -isystem. Thus, let us
explicitly disable diagnostics while parsing the Kokkos header.
Otherwise, the following warning might get emitted:
```
[1/1] Building CXX object source/base/CMakeFiles/object_base_release.dir/partitioner.cc.o
In file included from /usr/include/trilinos/desul/atomics/Fetch_Op.hpp:30,
                 from /usr/include/trilinos/desul/atomics/Generic.hpp:13,
                 from /usr/include/trilinos/desul/atomics/Atomic_Ref.hpp:14,
                 from /usr/include/trilinos/desul/atomics.hpp:12,
                 from /usr/include/trilinos/Kokkos_Atomics_Desul_Wrapper.hpp:28,
                 from /usr/include/trilinos/Kokkos_Atomic.hpp:50,
                 from /usr/include/trilinos/impl/Kokkos_Atomic_View.hpp:20,
                 from /usr/include/trilinos/impl/Kokkos_ViewMapping.hpp:32,
                 from /usr/include/trilinos/Kokkos_View.hpp:489,
                 from /usr/include/trilinos/Kokkos_Parallel.hpp:31,
                 from /usr/include/trilinos/Kokkos_MemoryPool.hpp:26,
                 from /usr/include/trilinos/Kokkos_TaskScheduler.hpp:34,
                 from /usr/include/trilinos/Kokkos_Serial.hpp:36,
                 from /usr/include/trilinos/decl/Kokkos_Declare_SERIAL.hpp:21,
                 from /usr/include/trilinos/KokkosCore_Config_DeclareBackend.hpp:22,
                 from /usr/include/trilinos/Kokkos_Core.hpp:45,
                 from /home/tamiko/workspace/dealii/include/deal.II/base/exceptions.h:21,
                 from /home/tamiko/workspace/dealii/include/deal.II/base/array_view.h:21,
                 from /home/tamiko/workspace/dealii/include/deal.II/base/mpi.h:21,
                 from /home/tamiko/workspace/dealii/include/deal.II/base/mpi_consensus_algorithms.h:21,
                 from /home/tamiko/workspace/dealii/include/deal.II/base/mpi_compute_index_owner_internal.h:21,
                 from /home/tamiko/workspace/dealii/source/base/partitioner.cc:16:
In function ‘T desul::Impl::host_atomic_fetch_oper(const Oper&, T*, dont_deduce_this_parameter_t<const T>, MemoryOrder, desul::MemoryScopeCaller) [with Oper = sub_operator<int, const int>; T = int; MemoryOrder = desul::MemoryOrderRelaxed]’,
    inlined from ‘T desul::Impl::host_atomic_fetch_sub(T*, T, MemoryOrder, MemoryScope) [with T = int; MemoryOrder = desul::MemoryOrderRelaxed; MemoryScope = desul::MemoryScopeCaller]’ at /usr/include/trilinos/desul/atomics/Fetch_Op_Generic.hpp:40:1,
    inlined from ‘T desul::atomic_fetch_sub(T*, T, MemoryOrder, MemoryScope) [with T = int; MemoryOrder = MemoryOrderRelaxed; MemoryScope = MemoryScopeCaller]’ at /usr/include/trilinos/desul/atomics/Generic.hpp:54:3,
    inlined from ‘T Kokkos::atomic_fetch_sub(T*, desul::Impl::dont_deduce_this_parameter_t<const T>) [with T = int]’ at /usr/include/trilinos/Kokkos_Atomics_Desul_Wrapper.hpp:85:125,
    inlined from ‘void Kokkos::Impl::HostSharedPtr<T>::cleanup() [with T = Kokkos::Impl::SerialInternal]’ at /usr/include/trilinos/impl/Kokkos_HostSharedPtr.hpp:120:5,
    inlined from ‘Kokkos::Impl::HostSharedPtr<T>::~HostSharedPtr() [with T = Kokkos::Impl::SerialInternal]’ at /usr/include/trilinos/impl/Kokkos_HostSharedPtr.hpp:92:45,
    inlined from ‘Kokkos::Serial::~Serial()’ at /usr/include/trilinos/Kokkos_Serial.hpp:87:7,
    inlined from ‘Kokkos::RangePolicy<Kokkos::Serial, Kokkos::IndexType<int> >::~RangePolicy()’ at /usr/include/trilinos/Kokkos_ExecPolicy.hpp:67:7,
    inlined from ‘void Kokkos::parallel_for(const std::string&, const ExecPolicy&, const FunctorType&) [with ExecPolicy = RangePolicy<Serial, IndexType<int> >; FunctorType = Impl::ViewFill<View<int*, LayoutRight, Device<Serial, AnonymousSpace>, MemoryTraits<0> >, LayoutRight, Serial, 1, int>; Enable = void]’ at /usr/include/trilinos/Kokkos_Parallel.hpp:147:1:
/usr/include/trilinos/desul/atomics/Fetch_Op_ScopeCaller.hpp:44:1: warning: pointer used after ‘void operator delete(void*, std::size_t)’ [-Wuse-after-free]
   44 | DESUL_IMPL_ATOMIC_FETCH_OPER(DESUL_IMPL_HOST_FUNCTION, host)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /home/tamiko/workspace/dealii/include/deal.II/base/numbers.h:28,
                 from /home/tamiko/workspace/dealii/build/include/deal.II/base/config.h:579,
                 from /home/tamiko/workspace/dealii/include/deal.II/base/mpi_compute_index_owner_internal.h:19:
In member function ‘void Kokkos::Impl::HostSharedPtr<T>::cleanup() [with T = Kokkos::Impl::SerialInternal]’,
    inlined from ‘Kokkos::Impl::HostSharedPtr<T>::~HostSharedPtr() [with T = Kokkos::Impl::SerialInternal]’ at /usr/include/trilinos/impl/Kokkos_HostSharedPtr.hpp:92:45,
    inlined from ‘Kokkos::Serial::~Serial()’ at /usr/include/trilinos/Kokkos_Serial.hpp:87:7,
    inlined from ‘Kokkos::RangePolicy<Kokkos::Serial, Kokkos::IndexType<int> >::~RangePolicy()’ at /usr/include/trilinos/Kokkos_ExecPolicy.hpp:67:7,
    inlined from ‘Kokkos::Impl::ParallelFor<Kokkos::Impl::ViewFill<Kokkos::View<int*, Kokkos::LayoutRight, Kokkos::Device<Kokkos::Serial, Kokkos::AnonymousSpace>, Kokkos::MemoryTraits<0> >, Kokkos::LayoutRight, Kokkos::Serial, 1, int>, Kokkos::RangePolicy<Kokkos::Serial, Kokkos::IndexType<int> >, Kokkos::Serial>::~ParallelFor()’ at /usr/include/trilinos/Serial/Kokkos_Serial_Parallel_Range.hpp:26:7,
    inlined from ‘void Kokkos::parallel_for(const std::string&, const ExecPolicy&, const FunctorType&) [with ExecPolicy = RangePolicy<Serial, IndexType<int> >; FunctorType = Impl::ViewFill<View<int*, LayoutRight, Device<Serial, AnonymousSpace>, MemoryTraits<0> >, LayoutRight, Serial, 1, int>; Enable = void]’ at /usr/include/trilinos/Kokkos_Parallel.hpp:147:1:
/usr/include/trilinos/impl/Kokkos_HostSharedPtr.hpp:120:5: note: call to ‘void operator delete(void*, std::size_t)’ here
  120 |     KOKKOS_IF_ON_HOST((
      |     ^~~~~~~~~~~~~~~~~
```

Merge pull request #15611 from masterleinad/remove_deprecated_cellmesaure_gridreordering

Remove deprecated functions in GridReordering

Merge pull request #15627 from bangerth/affine-constraints-8

Fix the name of a variable.

Merge pull request #15628 from bangerth/debug

Only run a test in debug mode.

Fix quicktests

Use a reference to a const value in one place

Mark some constructors as explicit

Mark a 'virtual' function as such.

Get rid of VectorSpaceVector in the LinearAlgebra::TpetraWrappers::Vector class.

Introduce tria_orientation.h

Significantly expand the orientation module.

Fix ECL in read_write_operation_contiguous

Merge pull request #15619 from masterleinad/fix_optimization_tests_cxx17

Fix missing include file for optimization/line_minimization.h

add a news/changes entry

CMake: record git information in a separate configuration file

Merge pull request #15594 from lethe-cfd/step-68-typos

Clear the meaning of  frequency in step-68

Merge pull request #15590 from lethe-cfd/step-68-performance-test

Add Step-68 performance test

Only run a test in debug mode.

The test checks that we fail in by triggering an Assert. But we only hit that
error in debug mode, of course.

Fix the name of a variable.

reindent

Parallelize some operations in AffineConstraints::close().

Add sequential parallel_for.

Use std::move instead of std::swap.

Merge pull request #15605 from pcafrica/particle_fullydistributed_test

Make ParticleHandler serialization tests consistent

Merge pull request #15566 from tjhei/jenkins-ampere

[CI] add arm64 ampere linux build

Merge pull request #15559 from pcafrica/instantiate_fullydistributedtria

Instantiate templates for p::f::T

add a news/changes entry

lac/scalapack.cc: fix an out-of-bounds write that leads to a double free

```
==1080297==ERROR: AddressSanitizer: attempting free on address which was not malloc()-ed: 0x60200003da70 in thread T0
    #0 0x55bcdd907b7d in operator delete(void*) (/srv/temp/testsuite-IQZ1b8kK/build/tests/scalapack/scalapack_06b.debug/scalapack_06b.debug+0x17cb7d)
    #1 0x7fc52a4d2047 in void std::__1::__libcpp_operator_delete[abi:v160006]<void*>(void*) /usr/include/c++/v1/new:276:3
    #2 0x7fc52a4d2047 in void std::__1::__do_deallocate_handle_size[abi:v160006]<>(void*, unsigned long) /usr/include/c++/v1/new:300:10
    #3 0x7fc52a4d2047 in std::__1::__libcpp_deallocate[abi:v160006](void*, unsigned long, unsigned long) /usr/include/c++/v1/new:316:14
    #4 0x7fc52a4d2047 in std::__1::allocator<int>::deallocate[abi:v160006](int*, unsigned long) /usr/include/c++/v1/__memory/allocator.h:131:13
    #5 0x7fc52a4d2047 in std::__1::allocator_traits<std::__1::allocator<int>>::deallocate[abi:v160006](std::__1::allocator<int>&, int*, unsigned long) /usr/include/c++/v1/__memory/allocator_traits.h:288:13
    #6 0x7fc52a4d2047 in std::__1::__split_buffer<int, std::__1::allocator<int>&>::~__split_buffer() /usr/include/c++/v1/__split_buffer:362:9
    #7 0x7fc52a4d2047 in std::__1::vector<int, std::__1::allocator<int>>::__append(unsigned long) /usr/include/c++/v1/vector:1049:5
    #8 0x7fc52a8282d2 in std::__1::vector<int, std::__1::allocator<int>>::resize(unsigned long) /usr/include/c++/v1/vector:1910:15
    #9 0x7fc52a8282d2 in dealii::ScaLAPACKMatrix<double>::eigenpairs_symmetric(bool, std::__1::pair<unsigned int, unsigned int> const&, std::__1::pair<double, double> const&) /srv/temp/testsuite-IQZ1b8kK/dealii/source/lac/scalapack.cc:1684:17
    #10 0x7fc52a826813 in dealii::ScaLAPACKMatrix<double>::eigenpairs_symmetric_by_index(std::__1::pair<unsigned int, unsigned int> const&, bool) /srv/temp/testsuite-IQZ1b8kK/dealii/source/lac/scalapack.cc:1446:12
    #11 0x55bcdd911907 in void test<double>(unsigned int, unsigned int, double) /srv/temp/testsuite-IQZ1b8kK/dealii/tests/scalapack/scalapack_06b.cc:134:21
    #12 0x55bcdd90ebc8 in main /srv/temp/testsuite-IQZ1b8kK/dealii/tests/scalapack/scalapack_06b.cc:207:9
    #13 0x7fc4f5250989  (/usr/lib64/libc.so.6+0x23989)
    #14 0x7fc4f5250a44 in __libc_start_main (/usr/lib64/libc.so.6+0x23a44)
    #15 0x55bcdd7f73f0 in _start (/srv/temp/testsuite-IQZ1b8kK/build/tests/scalapack/scalapack_06b.debug/scalapack_06b.debug+0x6c3f0)
```

Rename a variable.

Micro-optimize a loop.

Fix range-based for loops over the cells of triangulations.

Fix missing include file for optimization/line_minimization.h

Suppress warning in p::s::T

Use C++17-style fold expressions.

CMake: simplify Target.config generation

Let us call the export(TARGETS ...) function at one central place. This
simplifies the configuration logic significantly and avoids accidentally
recreating the file.

CMake: avoid updating deal.IIConfig.cmake when nothing changed

CMake: split compiler/linker flags sanity checks into extra file

Update the documentation in a few places to refer to C++17.