fixed the "No X Crossing option "Made 0-x verts snap to eachother.
Added mesh_mirror_tool
This is a tool that makes verts mirror, so that you can use xmirror in editmode and weight painting.
Have imported a heap of models that are made mirrored but are slightly out of being in the range that blender uses to be mirrored.
So this means I can make a models verts snap to its mirrored locations.
Options are Limit, Mode l>R, R>L or Middle, Normal Weigting, only mirror Same edge user count may add support for mirroring vert weights later.
It just uses the closest to copy the weights, but this means the meshes need not have the same number of verts.
Worldspace coords are used so the meshes only need to overlap in worldspace.
