RATIONALIZE, replacing a less-accurate version inherited from
primordial CMUCL.
+Cyrus Harmon:
+ He fixed many PPC FFI and callback bugs.
+
Matthias Hoelzl:
He reported and fixed COMPILE's misbehavior on macros.
APD Alexey Dejneka
PFD Paul F. Dietz
NJF Nathan Froyd
+CLH Cyrus Harmon
AL Arthur Lemmens
DFL David Lichteblau
RAM Robert MacLachlan