Merge pull request #2085 from djfm/1.6

[*] LO : Updated Canadian Taxes and States
[-] BO : Fix bug #PSCSX-3212, bad warning
Merge branch '1.6' of ssh://github.com/PrestaShop/PrestaShop into 1.6
[-] WS : Fix #PSCFV-12454
Merge branch '1.6' of https://github.com/PrestaShop/PrestaShop into 1.6
// Small fix
[-] BO : Fix PSCFV-11851 Error with firefox cache when use reload
Merge branch '1.6' of github.com:PrestaShop/PrestaShop into 1.6
[-] WS : Fix bad xlink in combination association image
[-] WS : Fix duplicate id in images/products entity
Merge branch '1.6' of https://github.com/PrestaShop/PrestaShop into 1.6
[-] WS : Fix PSCSX-1564 execute hook updateProduct on product change
[-] WS : Fix warning
[-] BO: Fix IOs stress on AdminModulesController
// follow up #PSCSX-3208
Merge branch '1.6' of ssh://github.com/PrestaShop/PrestaShop into 1.6
// Fix Messages KPI on adminorders
// missing file
[-] FO : Fix #PSCSX-3211 no more duplicate product when reorder with cart_rule
Merge branch '1.6' of github.com:PrestaShop/PrestaShop into 1.6
[-] BO : Fix #PSCSX-2652, show confirmation for multiple update (see https://github.com/PrestaShop/PrestaShop/commit/f72c6d71a9ee6ce8a11758a78c891c6458c959d3 )