Merge remote-tracking branch 'tobias/master'

dune/stuff/common/exceptions.hh

dune/stuff/common/fixed_map.hh

dune/stuff/common/float_cmp.hh

dune/stuff/common/fmatrix.hh

dune/stuff/common/fvector.hh

dune/stuff/common/matrix.hh

dune/stuff/common/parallel/helper.hh

dune/stuff/common/parallel/threadmanager.cc

dune/stuff/common/parameter/configcontainer.cc

dune/stuff/common/parameter/configcontainer.hh

dune/stuff/common/parameter/validation.hh

dune/stuff/common/print.hh

dune/stuff/common/random.hh

dune/stuff/common/ranges.hh

dune/stuff/common/string.hh

dune/stuff/common/tuple.hh

dune/stuff/common/vector.hh

dune/stuff/fem/localmassmatrix.hh

dune/stuff/test/common_fixed_map.cc

dune/stuff/test/common_math.cc