Bug 16768 - Add official number format for Switzerland: 1'234'567.89

Bug 16768 - Add official number format for Switzerland: 1'234'567.89

This patch adds the official number format for Switzerland (CH) and makes
it selectable in syspref 'CurrencyFormat'

To test:
- Apply patch
- Set syspref 'CurrencyFormat' to '360'000.00 (CH)'
- Go to Home > Administration > Budgets administration
- Create or edit a budget with Total amount of 1234567.89
- Verify that the amount appears properly formated as 1'234'567.89

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>