renamed 'dune/marchingcubes/' to 'dune/tpmc/'
To follow the dune naming conventions a little bit more, I renamed the 'marchingcubes' directory to 'tpmc'. This led to some other necessary changes, hopefully I did not miss anything. If so, please let me know.
One thing we should keep in mind is that includes now could look like
#include <tpmc/thresholdfunctor.hh>
#include <tpmc/fieldtraits.hh>
#include <dune/tpmc/utilities.hh>
#include <dune/tpmc/isdegenerated.hh>
For me, that seems to be potentially confusing.
Edited by Hendrik Kleikamp