OP2/PyOP2 — pull request #283 by kynan (2013-12-02 15:26:25+00:00)
Title: Add compute_{min,max}_facet_edge_length_tetrahedron_3d

These functions are required in FFC kernels to compute normals in 3D.

Also add an md5 hash of pyop2_geometry.h to the FFC kernel cache to
make it a little more robust.