[FIX] point_of_sale: prevent negative bank payments
[FIX] point_of_sale: use the same rounding sequence as the backend

Conflicts:
	addons/point_of_sale/static/src/js/models.js
Merge remote-tracking branch 'odoo/8.0' into 8.0
Slovene translations by Matmoz
Line commented out for custom module needs
base translations changes
Slovene translation added
Translations update
Merge branch '8.0' of github.com:sysadminmatmoz/odoo into 8.0