Bug 18263: Make use of syspref 'CurrencyFormat' for Account and Pay fines tables

Bug 18263: Make use of syspref 'CurrencyFormat' for Account and Pay fines tables

On Home > Patrons > Accounts for... and Home > Patrons > Pay fines for...,
make the amounts display as defined in syspref 'CurrencyFormat'

To test:
- Apply patch
- Give a patron a high fine or credit (e.g. 12345.67)
- Got to pages Home > Patrons > Accounts for... and
  Home > Patrons > Pay fines
- Verify that amounts display following syspref 'CurrencyFormat'
  (e.g. 12'345.67 for syspref set to 360'000.00 (CH)

Signed-off-by: Mirko Tietgen <mirko@abunchofthings.net>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>