Shrink the default image size
Checkpoint Parallels work
More progress on Parallels guest.  Still does not actually work.
Clean up the VMWare-guest option:
 * Let the disk image get built in the usual place, then
   move it into the VM directory in post-unmount.  That consolidates
   a lot of the file naming.
 * Use simple static names (Disk0.vmdk, VirtualMachine.vmx) for
   the config files.  That further simplifies things.
 * Clean up comments, document the directory structure, include
   links to VMWare and sanbarrow documentation.
Improve ReadMe