Merge branch 'master' into feature/proper-simd-interface

cmake/modules/CMakeLists.txt

cmake/modules/DuneCMakeCompat.cmake

cmake/modules/DunePythonCommonMacros.cmake

cmake/scripts/sphinx_cmake_dune.py

dune/common/CMakeLists.txt

dune/common/alignment.hh

dune/common/array.hh

dune/common/debugallocator.hh

dune/common/forloop.hh

dune/common/identitymatrix.hh

dune/common/lru.hh

dune/common/mallocallocator.hh

dune/common/nullptr.hh

dune/common/shared_ptr.hh

dune/common/std/CMakeLists.txt

dune/common/std/constexpr.hh

dune/common/std/final.hh

dune/common/test/CMakeLists.txt

dune/common/test/arraydeprecationtest.cc

dune/common/test/boundscheckingmvtest.cc