Include a link to Francois's po-utils.

Doc/lib/libgettext.tex

@@ -315,8 +315,9 @@ doesn't understand the myriad of string types support by Python.  The
 standard Python distribution provides a tool called
 \program{pygettext} that does though (found in the \file{Tools/i18n/}
 directory).\footnote{Fran\c cois Pinard has written a program called
-\program{xpot} which does a similar job.  It is distributed separately
-from the Python distribution.
+\program{xpot} which does a similar job.  It is available as part of
+his \program{po-utils} package at
+\url{http://www.iro.umontreal.ca/contrib/po-utils/HTML}.
 }  This is a command line script that
 supports a similar interface as \program{xgettext}; see its
 documentation for details.  Once you've used \program{pygettext} to