The command file ADD_LIST.COM will add a definition (P2) to a
library list (P1).  The ususal library lists are HLP$LIBRARY
and LNK$LIBRARY, the only two I have yet encountered that use
this method.  P2 is defined as the translation (in the JOB
table) of the first of the following that is undefined:

	'P1'
	'P1'_1
	'P1'_2
	...

Example:

	HLP$LIBRARY and HLP$LIBRARY_1 are defined.
	Then the command @ADD_LIST HLP$LIBRARY FOO.BAR
    will execute the command

	$ DEFINE HLP$LIBRARY_2 FOO.BAR
