Bug 15845: Renewal date in circulation.pl is not always correct and not even used

Bug 15845: Renewal date in circulation.pl is not always correct and not even used

If you have a patron category with a hard renewal date, the enrolllment
period will be zero. You cannot calculate the renewal date as is done
in the script currently.

Even more, the renewaldate template var is not even used.

Test plan:
[1] Verify that checkin/checkout works as expected.
[2] Git grep on renewaldate
[3] Check the code in circulation.pl for "$renew"

Signed-off-by: Marc Véron <veron@veron.ch>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Brendan Gallagher brendan@bywatersolutions.com