CogVM binaries as per VMMaker.oscog-eem.1113/r3284
Redo free space allocation on Spur image load. Provide a minimum ammount of
free space, taking into account extant free space. Provisionally use
extraVMMemory in the header, defaulting to growHeadroom if extraVMMemory is
empty. This can be revised if folks protest.
Exclude dumpImage: from Spur (no seg support yet)
These include release candidate Spur VMs for Squeak 5.
--