[FIX] product: when converting unit of mesures, round above instead of mathematical rounding
[IMP] mrp: use also the ceiling method from product
[IMP] base_import: update select2 lib to revision 3.4.5
[IMP] select2: allow translation of information messages, avoid the need of locale files from select2
[IMP] product: add python tests
[IMP] will add bootstrap style once needed
[FIX] base_import: update the select2 library up to version 3.4.5

This fixes rendering issue in firefox (mouseover bar chart in dashbord view)
Replace the new localisation of select2 by our translation system
[IMP] remove useless imports
[FIX] product: when converting unit of mesures, use ceiling instead of rounding method

This avoids flows to be stucked when a convertion would move/reserve/buy less pieces than the number required (eg: MTO product where supplier has a UoM bigger than the one on the sale order)
[FIX] use float rounding for pricelist instead of ceiling
[FIX] use float rounding for pricelist instead of ceiling