SoftBody patch with UV texture coordinates

[mi076]

Small btSoftBodyHelpers CreatePatch modification, gives little more control over
patch and calculates UV coordinates. Comments. Just added two new functions CreatePatchUV and CalculateUV (they can be used standalone too, both static).
S. my post in "Demos" Forum for example. Arguments are same as for original CreatePatch plus array of floats to write texture coordinates into (if not given or NULL no coordinates will be generated).

[Erwin Coumans]

It looks useful, so we accept the contribution:

http://code.google.com/p/bullet/source/detail?r=1383

Thanks for sharing this,
Erwin