New facility added by Chrism and Ianj 17/8/79

In the list of file dependencies a name may now be replaced by

	archive-name ( module1 module2 .... )

the modify dates of the modules within the archive are used to
determine if any change necessary.

Also note that rules for making archive-name are followed, but
note that if archive is called x.o and an x.s exists (or suffix rule)
then x.o will be zapped by x.s a.out !!
