Bug 19804: Add a 'Fine charging interval' for suspension days

Bug 19804: Add a 'Fine charging interval' for suspension days

We already have a chargeperiod (Fine charging interval) value which is
taken into account for fine ($) for not for the suspension period.

This patch adds a new column suspension_chargeperiod (Fine day charging
interval) to add the same behaviour when a suspension is calculated.

Test plan:
Add overdue item and play with the circulation rules (and the calendar).
The suspension period must be correctly calculated.
Please provide the different tests you made.

Signed-off-by: Hugo Agud <hagud@orex.es>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>