Bug 12844: Use Koha::Number::Price where it can be useful

Bug 12844: Use Koha::Number::Price where it can be useful

This patch use the new module into pl and tt script.

Note that we could use it in the acqui/pdfformat/layout*.pm files.

Test plan:
1/ Verify that the acquisition home page displayes the prices as before.
2/ Verify that the budgets page displayes the prices as before.
3/ Verify that the funds page displayes the prices as before.
4/ Verify that the planning page displayes the prices as before. (Note
that 1 price is now formatted: 'Fund remaining').
5/ Create an order from a staged file. This stage file should contain a
formatted price.

Signed-off-by: Paola Rossi <paola.rossi@cineca.it>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>