Provides commands \setcounterref and \addtocounterref which use
the section (or whatever) number from the reference as the
value to put into the counter, as in: ...\label{sec:foo} ...
\setcounterref{foonum}{sec:foo} Commands \setcounterpageref and
\addtocounterpageref do the corresponding thing with the page
reference of the label. No .ins file is distributed; process
the .dtx with plain TeX to create one.
