added Makefile flag "MORTALINSTALL" which removes -o/-g from

	install arguments:
MORTALINSTALL	If "yes", then omit setting group and ownership on
		all files that are installed. This can be used to
		permit non-root to install files, particularly
		useful when working across NFS, or when $DESTDIR
		is local. Do not use on production systems.

	This relates to PR bin/3563.
	These files are being checked into a branch because I want
	them carefully reviewed by various parties, and because they
	are not fully tested.