BUG: Various fixes
- I accidently turned vsync on by default when introducing the flag. This shouldn't be default behaviour.
- Little tuning on the haptic examples now that they can run more consistently (without the hiccup of the vsync). Stiffer.
- Fix some edge cases in an old constraint I encountered for which resulted in nans.
- Fixes 0 length capsule which is a sphere.
Edited by Andrew Wilson