Enable new bevel tool code in bevel modifier.

Now modifier takes a segments parameter.
Bevel edge weights will multiply the overall amount.
For vertex-only, you can give a vertex group name,
and the weights in that will multiply the overall amount.



git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@54713 954f8c5b-7b00-dc11-b283-0030488c597c