Tom Lane dff84dc762 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.

2006-09-09 04:07:52 +00:00

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