Henrik Stolzmann authored Jun 03, 2019 and Ansgar Burchardt committed Jul 09, 2019

The `TET_RULESET` compile-time option could be used to load
tetrahedron refinement rules from `RefRules.data`, however this
requires to locate the file at run-time.  This was too inconvenient.

Instead generate `RefRules.cc` from `RefRules.data` including the
refinement rules and use that.