This patch extends the mesh.bisect() operator by a split option. With this option you are able to create 2 independent Mesh Islands out of the mesh parts in
front of and behind the bisection plane. Together with the fill option both open mesh island cutting loops will be filled with a face each. This way you can quickly
fracture a mesh manually into shards.
Usage: Simply use the bisect operator as usual, and check the split checkbox and optionally the fill checkbox to see the new functionality.