Bug 17443: Make possible to renew patron by later of expiry and current date

Bug 17443: Make possible to renew patron by later of expiry and current date

Test plan
1) Apply the patch
2) Go to system preferences and find the BorrowerRenewalPeriodBase and note there is new option "the later of current and expiry date"
3) Try all three options and confirm they work as expected
   3.1) The new options should be tested et least with two patrons - one with expiry date in past and one with expiry date in future

Signed-off-by: radiuscz <radek.siman@centrum.cz>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>