Bug 15770: Do not format numbers if too big

Bug 15770: Do not format numbers if too big

At several places we got the following error if we use numbers too big
for Number::Format
Template process failed: undef error - round() overflow. Try smaller
precision or use Math::BigFloat at /home/koha/src/Koha/Number/Price.pm line 44

It make the app explodes.
The goal here is to handle these errors gracefully and easily.

Test plan:
- Add a manual fine to a patron of 100000000000000
- Create a patron category with an enrolment fee of 123456789012345

Signed-off-by: Mark Tompsett <mtompset@hotmail.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>