0.6.10.2:

0.6.10.2:
	merged MNA LOAD-FOREIGN patch (sbcl-devel 2001-01-10)
	tweaked LOAD-FOREIGN and RUN-PROGRAM to use :ENVIRONMENT
		instead of lossy :ENV by preference
	renamed GET-UNIX-ENVIRONMENT to SB-EXT:POSIX-ENVIRON, by
		analogy with SB-EXT:POSIX-GETENV
	removed (MERGE-PATHNAMES PROGRAM "path:") in RUN-PROGRAM,
		since it refers to a search list which isn't
		defined in SBCL (and since I'd like to remove all
		support for search lists anyway).
	SB-EXT is a public interface package not really intended as a
		home for implementations; switched IN-PACKAGEs
		to use SB-IMPL instead
	To support this, SB-IMPL should USE SB-C-CALL and SB-ALIEN
		as SB-EXT does.
	made RUN-PROGRAM default to copying Unix environment
	added LOAD-FOREIGN and RUN-PROGRAM test cases