build tetrahedron refinement rules into library

Ansgar Burchardtrequested to merge
build-tetrahedron-refrules-into-library into master

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.

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