major namespace, renaming and (re)moving

dune.module

dune/stuff/common/color.hh

dune/stuff/common/debug.hh

dune/stuff/common/filesystem.hh

dune/stuff/common/header/disable_warnings.hh

dune/stuff/common/logging.hh

dune/stuff/common/math.hh

dune/stuff/common/misc.hh

dune/stuff/common/parameter/configcontainer.hh

dune/stuff/common/parameter/validation.hh

dune/stuff/common/print.hh

dune/stuff/common/profiler.hh

dune/stuff/common/signals.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_color.cc

dune/stuff/test/common_parameter_vaalidation.cc