Implemented FORCE as a compiled procedure. SF no longer integrates

Implemented FORCE as a compiled procedure.  SF no longer integrates
FORCE as a primitive procedure.

There is a minor bootstrapping problem with the standard build
scripts since any pre-existing version of SF will integrate the
primitive FORCE, and SF is only run on files that have changed.
A solution is:

    1. rebuild the system
    2. remove any .bin files that call FORCE
    3. rebuild the system using bands produced in step 1.

Timings under Scheme 8.0 on plex:

	Test	Primitive	Compiled
	 [1]	 10370ms	  560ms
	 [2]	   180ms	  130ms
	 [3]       440ms	  270ms

(let ((nums (list->stream (make-initialized-list 100001 identity-procedure)))
      (primes
       ((access make-prime-numbers-stream (->environment '(runtime stream))))))
  (show-time (lambda () (stream-ref nums 100000)))    ; [1]
  (show-time (lambda () (stream-ref nums 100000)))    ; [2]
  (show-time (lambda () (stream-ref primes 1000))))   ; [3]