2.86
fix many warnings remove btMultiSapBroadphase.* make collisionFilterGroup/collisionFilterMark int (instead of short int)
add the 'extras' and Bullet 2 tests, to make it easier to create a new intermediate release
Remove useless const qualifiers from returns
[InverseDynamics] Support for Jacobians & derivatives
fix a few warnings
add VHACD, with the addition of Wavefront .obj export
Merge remote-tracking branch 'bp/master'