Blender Git Loki

- modify CCG to not crash when passed invalid faces, just ignores
that face... this situation should still not happen with well
written modifiers but at least it won't crash now
- bug fix in mirror modifier, calculation during editmode did not
check to make sure built mface's had valid indices... grr the
==0 tagging system is really a pain.
- convert a few uiDefBut calls to use explicit type