Function for writing nif files does not work yet (have not yet figured out why).

WIP: trying to make smart pointers work again with SWIG; for the moment I commented out most of the SWIG interface to reduce wrapper size and compilation time while testing

* only build python wrapper if SWIG is detected
* option to turn of python wrapper build

(python wrapper still WIP)

Added configurations for Maya 8.0 and 8.5 to Maya solution.  May not work.

Committing the changes to the SConstruct SCONS build system file that Xoalin contributed through the forums.  Thanks Xoalin!  I'm told that Niflib now compiles on GCC =)

Properly capitalized include file names in niflib.cpp.

Changed some functions to use pointers instead of Ref templates.
Updated to latest XML description.

  -----   
o Exporter
  - Add BSX flags for NIF exports when animation is involved for Oblivion.
  - Worked around what appears to be a bug in the Bezier Scale controller.
  - Change time intervals when exporting MW style animation.
  - Fixed bug with missing reference in Footer in MW exported .KF files.
  - Call routine to apply skin offsets to Skin data (required for MW?)

o Importer

  - Invoke Max Script in Max 5 so that we can import Note Tracks

  -----   
o Exporter
  - Fix Collapse Transforms on dialog so that it actually triggers collapse
  - Change defaults for textures so Morrowind does not crash in CS
  - Fix export of animation for Morrowind
  - Introduce mechanism in Collapse Transforms so that poorly scaled models export better

o Importer
  - Fix import of animation for Morrowind

NiNode::IsSplitMeshProxy now returns false if it is a skin influence.
NiTriShapeData::GetTriangles now only returns valid triangles.

Fixed a bug in ComplexShape::Merge that occurred when a shape had no UV set, but, for some reason, had a texture referencing UV set zero.
Changed NiSkinData::NormalizeWeights to use doubles, trying to increase the accuracy.

ComplexShape::Split now cuts out weights below 0.1 and normalizes the result.
Fixed a bug which could cause NiSkinInstance to try to call a function on a NiNode that was in the midst of destruction.
Removed some cout statements.