Fix import issue with Morrowind by basically rebuilding niflib correctly and rolling back a last minute change that I made after misinterpreting one of Shon's changes.

Added a staging area under Importer directory for the build intended to be submitted for a release.

Add some new options to better auto-detect where the imported nif is coming from and default to correct application based on root paths.  Also add some assistance for locating skeleton.nif files if needed.

2. Fix bug with matrix inversion missing.  
3. Use Point3(0,0,0) instead of Point3()