Bug 18786: Add ability to create custom payment types

Bug 18786: Add ability to create custom payment types

Some libraries would like to be able to specify more specific payment types such as cash, check, credit card, or even canned food ( for food drives ). This feature will allow a library to specify payment types as authorised values of the type PAYMENT_TYPE.

Test Plan:
1) Apply patches
2) Update database
3) Add authorised value PAYMENT_TYPE with values 'Cash', 'Check', 'Credit card'
4) Go to the fines section of a patron who has several fines
5) Tab 'Fines'
6) Click on 'Pay' for an individual fine
7) Verify that in the form a 'Pay an individual fine' dropdown appears with payment types
8) Select a payment type, confirm payment
9) Verify that payment type appears in "Description of charges" in tab 'Account'

Signed-off-by: Marc Véron <veron@veron.ch>
Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Bug 18786: Remove use of Koha::Patron::Images

Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Bug 18786: Remove duplicate block with bad IF

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