Merge from mainline + fix a bug in petsc_vector_base.

git-svn-id: https://svn.dealii.org/branches/branch_bigger_global_dof_indices_4@29688 0785d39b-7218-0410-832d-ea1e28bc413d

diff --cc deal.II/include/deal.II/lac/petsc_vector_base.h
index 630bd2a49371a9096f3d02fa3c9166e13e98e7de,4222be10e12efe1abbe92b6a50bf4fec5aac7286..8159b285f1027e5929689fcefb3473807959f51c
--- 1/deal.II/include/deal.II/lac/petsc_vector_base.h
--- 2/deal.II/include/deal.II/lac/petsc_vector_base.h
+++ b/deal.II/include/deal.II/lac/petsc_vector_base.h
@@@ -1159,7 -1151,7 +1159,7 @@@ namespace PETScWrapper
      IndexSet is (size());
  
      // PETSc only allows for contiguous local ranges, so this is simple
--    const std::pair<unsigned int, unsigned int> x = local_range();
++    const std::pair<size_type, size_type> x = local_range();
      is.add_range (x.first, x.second);
      return is;
    }