docs and createlang patch for plperl

Attached is a tarball that contains:

pl-perl.sgml - A start at documentation.
Thomas, I didn't know where this belongs. Does
it need to be integrated into the user manual
or should it stand on its own. If it needs
to stand alone, then all the docbook declarations
need to be added at the front.

createlang.sh.diff - a patch to add plperl
to the repertoire of createlang.sh
--
Mark Hollomon
mhh(at)mindspring(dot)com