packing 2400 rectanges is about 38x faster.
Use the C implimentation in uvcalc_lightmap and uvcalc_smart_project
Blender.c - filename returning None raises errors with existing scripts, just return "" so string functions on the filename dont raise an error.
object_sel2dupgroup, creates a dupliGroup from a set of selected objects, using the active as the transformation for the dupli-ob. The advantage of using thus script is that objects have this transformation removed.
