Bug 18790: Add ability to void payments

Bug 18790: Add ability to void payments

We've had the ability to 'reverse' a payment for a long time, but it
would be much better if we had a true void payment function that
replaces the paid amounts into the fee so that it appears as if the
payment was never made.

Test Plan:
1) Apply this patch and dependent patches
2) Run updatedatabase.pl
3) Create some fines
4) Pay those fines
5) Use the new 'void' button to void the payments
6) Note the fines were restored to their pre-payment amounts

Signed-off-by: Koha-us conference <koha-us@koha-us.net>
Signed-off-by: BWS Sandboxes <ByWaterSandboxes@gmail.com>

Signed-off-by: Josef Moravec <josef.moravec@gmail.com>

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>