Add contrib/isn module for ISBN/ISSN/EAN13/etc product numbers, and

Tom Lane <tgl@sss.pgh.pa.us>

Commit: dff84dc762bd225dbf69f5baa639560310053a74
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2006-09-09T04:07:52Z
Releases: 8.2.0
Add contrib/isn module for ISBN/ISSN/EAN13/etc product numbers, and
remove the old isbn_issn module which is about to be obsoleted by EAN13.
contrib/isn is by Germán Méndez Bravo.  Our thanks to Garrett A. Wollman
for having written the original isbn_issn module.

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