fix SIMD_2_PI macro, see Issue 773

git-svn-id: http://bullet.googlecode.com/svn/trunk@2717 08e121b0-ae19-0410-a57b-3be3395fd4fd
Fix convex cast normals for btScaledBvhTriangleShape: normals were already in world space
See Issue 371 THere seems to be some other issues, need to get a reproduction case.


git-svn-id: http://bullet.googlecode.com/svn/trunk@2718 08e121b0-ae19-0410-a57b-3be3395fd4fd