bug #2, zero length axis.

Tested using the file 'FBX_Export_Glitched.blend' from report: [#27964]

        also clear temp meshes after export.

    also fix error check and report the message rather then print it.

     also use LC's for Rot_Mesh and Copy_Faces functions.

previous order deprecated.

by Wintch Analyzer 

moving master working path initialization before connection creation

also added error checks and prints to debug an invalid internal state (related to another tracker entry)

exception safeguard in render engine
fix module import broken by someone else

add default texture option back
also added back options
- scale
- snap to whole value
- face thickness
- default brush

Mhx import: Rigify custom shapes now work even on second import. Rigify rig assigned to group for file linking.

 - Added tracker and wiki URLs
 - Fixed usage of Matrix.Rotation

[[Split portion of a mixed commit.]]