Merge branch 'fix_some_warnings' into 'master'

dune/common/debugalign.hh

dune/common/debugallocator.hh

dune/common/dynmatrixev.cc

dune/common/fmatrixev.cc

dune/common/math.hh

dune/common/simd.hh

dune/common/test/arithmetictestsuite.hh

dune/common/test/assertandreturntest.cc

dune/common/test/mpicollectivecommunication.cc

dune/common/test/overloadsettest.cc

dune/common/test/parameterizedobjectfactorysingleton.hh

dune/common/test/parameterizedobjecttest.cc

dune/common/test/stdapplytest.cc

dune/common/test/stdtypetraitstest.cc

dune/common/tupleutility.hh