stack version also builds FT2 and SSL plugins
VMMaker.oscog-eem.970:Revert those two cases; they were already covered.

VMMaker.oscog-eem.969:Two more cases where the mnu compilation breakpoint needs to be checked.Use numBytesOf: for length of selector.Rename checkValidInlineCacheTag: tovalidInlineCacheTag:.  Implement it in the right placein the obj rep hierarchy for Spur.Add a debug lookup routine that only looks up (and follows forwarding pointers).

VMMaker.oscog-eem.968:Update configs to inlcude Squeak Spur Stack 64 VM

VMMaker.oscog-eem.967:Extend the -breakmnu facilities to break oncreating MNU PIC entries, not just activating them.

VMMaker.oscog-eem.966:Add support for a -breakmnu vm argument that callswarning (or in the simulator, halts) on an mnu of aspecific selector.Update StackInterpreter's class comment.Eliminate a type clash with getLongFromFile:swap: