Re: Added index ability for isbn-issn contrib example

Added to contrib/isbn_issn for isbn and issn. Thanks.

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Dan Weston wrote:
> I tried to use the isbn data type created in the
> /usr/lib/pgsql/contrib/isbn_issn directory, but couldn't make isbn a
> primary key (it gave me an error message about no default operator class).
>
> A quick search of the Programmer's Guide gave me what I needed below,
> allowing the creation of a btree index. You might want the following to
> add to the file isbn_issn.sql twice, once for 'isbn' and once more
> changing 'isbn' to 'issn':

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