Bug 7678: Adds extended patron attributes in patron reports

Bug 7678: Adds extended patron attributes in patron reports

This patch allows to choose row and column amongst extended patron
attributes and to filter on them in reports/borrower_stats.pl

Signed-off-by: Marc Veron <veron@veron.ch>
Great, I was looking for such a feature.
Patch works as expected.

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>