0.6.11.27:

0.6.11.27:
	redid BYTE-BLT to use memmove(3) (so GENESIS will work again!)
	deleted unused %SP-BYTE-BLT, and some unused stuff in SB!SYS
	added error checking in DEF!STRUCT to catch any programmer
		errors of (DEFSTRUCT FOO ..) followed by
		(DEF!STRUCT (.. (:INCLUDE FOO)) ..)
	MNA MAKE-LOAD-FORM UNIX-HOST bug and patch (fixing a
		particular instance of the DEF!STRUCT programmer error)