Checkpointing progress.

* Fix bugs: got the sort to actually work, fix driver,
* moved the grovel tmp dir to the cache (depends on patch to ADG)
* started a compilation example -- fails for now (needs a way to tweak *central-registry*)
* refactored how multiple lisp implementations are handled.
* excised sbrody's painfully coded pre-escaping --
 will have to account for ${FASL} in a cleaner way if ever.
* re-worked the makefile generation somewhat.