Blender Git Loki

rewrite of the obj importer,
The original obj importer was ok but it gradually got slower
as it had to support quirks of rare files.

This importer supports these quirks without bad workarounds and ~250 less lines.

* Moved from NMesh to Mesh
* Import smooth groups as hard edges
* Import Lines from sketchup (Thanks Wavk)
* Uses less memory
* faster (On a 70meg poser test model, benchmarked from 130sec to 41.2sec)

Not yet supported from the old importer-
* Scaling down to a bounding area
* Importing multiple obj's at once
* Using existing materials in the .blend
* Importing as a group instance.