Fix #33915: tweak self intersection epsilon for motion blur a bit further, still
had some cases where there were artifacts. Also fix rendering error with shutter
time set to 0.

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@54051 954f8c5b-7b00-dc11-b283-0030488c597c
Mesh Cache UI:
* Modifier was not in alphabetical order
* No Icon was displayed in the Add Modifier menu. 

Note: Mesh Cache uses Mesh Deform Icon at the moment, needs a unique one. 

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@54052 954f8c5b-7b00-dc11-b283-0030488c597c