Remove references to hp::DoFHandler in the postprocessor.

Merge pull request #10574 from peterrum/error_estimator_dofhandlertype

Remove DoFHandlerType from numerics/error_estimator.h

Merge pull request #10569 from peterrum/n_raw_lines

Remove specialization of Tria::n_raw_lines()

Remove DoFHandlerType from numerics/error_estimator.h

Merge pull request #10568 from peterrum/ConstantFunction_tests_fix_

Fix tests with ConstantFunction without prefix

Remove specialization of Tria::n_raw_lines()

Fix tests with ConstantFunction without prefix

Merge pull request #10545 from tjhei/cell_measure_std_vector

introduce GridTools::cell_measure for std::vector

Merge pull request #10376 from krishnakumarg1984/krishna_fix_redundant_edge_step50

Merge pull request #10475 from krishnakumarg1984/fix_step52_minor_issues

fixes step-52 doc issue; the correct math expr is sin(x,pi/omega)=0

Merge pull request #10565 from masterleinad/remove_deprecated_functions

Remove ZeroFunction and ConstantFunction without prefix

apply suggestion

Remove ZeroFunction and ConstantFunction without prefix

introduce GridTools::cell_measure for std::vector

call cell_measure with a reference to CellData::vertices in ASPECT,
which no longer compiles.
Fix this by introducing an overload of cell_measure accepting an
ArrayView. The means a std::vector works directly.
Also switch the implementation around where the array calls the
ArrayView implementation.

Merge pull request #10563 from masterleinad/cleanup_dof_tools

Remove the deprecated DoFTools::extract_locally_owned_dofs

Remove the deprecated DoFTools::extract_locally_owned_dofs

Merge pull request #10555 from peterrum/dofhandlertype_remove_1

Merge pull request #10559 from drwells/remove-dofhandlertype-hp-fevalues

Remove DoFHandlerType from hp::FEValues templates.

Merge pull request #10558 from masterleinad/cleanup_dof_tools

Cleanup DoFTools hp::DoFhandler

Remove DoFHandlerType from dof_handler_policy.h/.cc

Merge pull request #10557 from drwells/remove-dofhandlertype-fevalues

Remove DoFHandlerType from FEValues templates.

Merge pull request #10554 from peterrum/pft_update

Small generialization in tria_description.cc

Remove DoFHandlerType from hp::FEValues templates.

Cleanup DoFTools hp::DoFhandler

Remove DoFHandlerType from FEValues templates.

Merge pull request #10552 from peterrum/CellAccessor_at_boundary

Simplify CellAccessor::at_boundary()

Merge pull request #10553 from peterrum/grid_tools_cache_04_update

Update output of tests/grid/grid_tools_cache_04

Merge pull request #10551 from peterrum/pft_remove_unused_function

Remove usused internal function

Small generialization in tria_description.cc

Update output of tests/grid/grid_tools_cache_04

Simplify CellAccessor::at_boundary()

Remove usused internal function convert_cell_id_binary_type_to_level_coarse_cell_id

Merge pull request #10481 from tcclevenger/add_test_for_transfer

MGTransferPrebuilt custom constraints test

Merge pull request #10363 from luca-heltai/rtree-of-locally-owned-active-cells

GridTools::Cache::get_locally_owned_cell_bounding_boxes_rtree()

Merge pull request #10516 from peterrum/exchange_cell_data_to_ghosts

Merge implementations of exchange_cell_data_to_(level)_ghosts

Merge pull request #10547 from masterleinad/fix_artificial_particles

Avoid accessing artificial cells in ParticleHandler

Merge pull request #10546 from tjhei/clang10-warnings

work around clang10 warnings

add test

Avoid accessing artificial cells in ParticleHandler

work around clang10 warnings

This fixes several Wdeprecated-copy warnings from tbb and some boost warnings.

Merge pull request #10542 from peterrum/celldata_nvertices

Pass number of vertices to CellData

Merge pull request #10527 from peterrum/refine_locally_owned

Check in GridRefinement::refine()/coarsen() if cell is locally owned

Merge pull request #10543 from masterleinad/fix_point_gradient

Fix missing instantiations for point_gradient

Merge pull request #10538 from peterrum/matrixfree_reinit

Remove DoFHandlerType from MatrixFree::reinit()

Fix missing instantiations for point_gradient

Merge pull request #10520 from nfehn/clarify_artifical_cells

Clarify docu of GridTools::find_active_cell_around_point()

Merge pull request #10541 from peterrum/std_ofstream

Specify std namespace

Pass number of vertices to CellData

Specify std namespace

fix docu of GridTools::find_active_cell_around_point()

Remove DoFHandlerType from MatrixFree::reinit()

Merge pull request #10539 from bangerth/language

Do not use 'black/whitelist' language.

Do not use 'black/whitelist' language.

Update doc/news/changes/minor/20200526LucaHeltai

Co-authored-by: Wolfgang Bangerth <bangerth@colostate.edu>

get_locally_owned_cell_bounding_boxes_rtree and covering.

Merge pull request #10524 from masterleinad/remove_mgcoarsegridlaciteration

Remove MGCoarseGridLACIteration

Merge implementations of exchange_cell_data_to_(level)_ghosts

Merge pull request #10536 from luca-heltai/rtree-of-particles

Particles as indexable.

Merge pull request #10334 from kronbichler/split_mf_initialize_indices

Split up MatrixFree::initialize_indices to speed up compilation

Split up MatrixFree::initialize_indices to speed up compilation

Particles as indexable.

Merge pull request #10525 from DavidSCN/enable_non_default_VAT

Enable non-default VectorizedArrayType in read_cell_data()

Merge pull request #10533 from jppelteret/doc_changelog_01

Add a missing contributor to a changelog entry

Add a missing contributor to a changelog entry

Merge pull request #10528 from peterrum/kelly_active_cell_index

Use active_cell_index() in KellyErrorEstimator::estimate()

Merge pull request #10523 from tamiko/fix_schmidts_double_checking

Thread/Task: Fix Schmidt's double checking

Use active_cell_index() in KellyErrorEstimator::estimate()

Check in GridRefinement::refine()/coarsen() if cell is locally owned

Remove make_vectorized and fix get_symmetric_gradient()

Merge pull request #10328 from peterrum/dofhandler_flat_rebased

Merge DoFHandler and hp::DoFHandler

Enable non-default VectorizedArrayType in read_cell_data()

switch to std::atomic<bool> instead of using std::atomic_bool

Thread/Task: Fix Schmidt's double checking

We have to use a std::atomic_bool instead of a bool to ensure proper
memory fencing, see [1] for an in-detail discussion.

[1] https://preshing.com/20130930/double-checked-locking-is-fixed-in-cpp11/

Remove MGCoarseGridLACIteration

Merge pull request #10522 from peterrum/exchange_cell_data_to_level_ghosts_auto

Remove auto from GridTools::exchange_cell_data_to_level_ghosts()

Merge pull request #10521 from tamiko/bugfix

Bugfix: Return a reference to *this in operator=

Merge DoFHandler and hp::DoFHandler

Merge pull request #10450 from peterrum/tria_inc

Triangulation/DoFHandler: binary incompatibility note

Remove auto from GridTools::exchange_cell_data_to_level_ghosts()

Merge pull request #10519 from tamiko/fix_test

lac/constraints_move: Fix undefined behavior

Merge pull request #10518 from peterrum/find_active_cell_fix

mpi/muelu_periodicity: fix test

Bugfix: Return a reference to *this in operator=

Wow. I missed this. Surprising that we did not get a compiler warning
for this.

This fixes tests bits/periodicity_06/07 [1, 2].

[1] That test something entirely different but luckily happen to trigger
this.

[2] https://cdash.43-1.org/testDetails.php?test=47189344&build=7349

terminate called after throwing an instance of 'std::system_error'
  what():  Operation not permitted

In reference to #10473

lac/constraints_move: Fix undefined behavior

It is undefined behavior to access an object that has been moved. It is
also not possible to "move back" an object.

In this particular case with the recent changes to ThreadLocalStorage
and AffineConstraints we run into an exception:

constraints_move.debug: ../nptl/pthread_mutex_lock.c:117: __pthread_mutex_lock: Assertion `mutex->__data.__owner == 0' failed.

(The move operation destroys the mutex and accessing it afterwards
when we try to move back results in a crash.)

Triangulation/DoFHandler: binary incompatibility

Fix test

Merge pull request #10517 from masterleinad/fix_unused_dof_handler_policy

Fix warning about an unused variable in dof_handler_policy.cc

Fix warning about an unused variable in dof_handler_policy.cc

Merge pull request #10492 from luca-heltai/add-doc-to-particle-handler-signal

Document particle_lost in particle handler.

Merge pull request #10497 from tjhei/add_feiv_mg_test

add a test for multilevel access of FEInterfaceValues

Merge pull request #10514 from tamiko/fix_tests

Tests: Update tests for changes in GridTools::find_active_cell_around_point

Merge pull request #10482 from christophkammer1989/master

Step 3 tutorial: problem statement inconsistency

Merge pull request #10487 from masterleinad/remove_constraint_matrix

Remove ConstraintMatrix reference

Merge pull request #10493 from tjhei/remove_travis

[CI] remove references to travis

Merge pull request #10503 from peterrum/dof_handler_policy_mg_simplification

Add GridTools::exchange_cell_data_to_level_ghosts()

Merge pull request #10507 from bangerth/tut-graph

Improve tutorial graph layout.

Merge pull request #10508 from bangerth/cmake

Better describe what we do when running cmake for code gallery programs.

Merge pull request #10511 from peterrum/tria_level_cell_iterator

Add alias Triangulation::level_cell_iterator

Merge pull request #10512 from bangerth/affine-3

Remove a surrounding class that is now no longer necessary.

Tests: Update tests for changes in GridTools::find_active_cell_around_point

Closes #10506
See also #10459

Add GridTools::exchange_cell_data_to_level_ghosts()