Bug 6835 - Ability to specify types of email address in overdue_notices.pl

 Adds the -email option to overdue_notices.pl, which is repeatable

 -email value can be:
   - 'email'
   - 'emailpro' or
   - 'B_email'

- perltidy done
- in production for a BibLibre customer
- validated by the customer

Signed-off-by: Claire Hernandez <claire.hernandez@biblibre.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>
Merge branch 'bug_6835' into 3.12-master