Boolean Fracture qL SOP

[johnnyquest]

• option: per-piece foreach boolean (also offer automatic connectivity partitioning)
• per-piece on fracture input also! somehow construct new name attribs from combination of names on the inputs?
• groups of what was inside/outside the cutting geometry (if closed) (or "opposite sides" if open?)
• option: error checking, for open surfaces (stop execution if found), this could also be implemented as a separate node