Removing displays_errors on Profiling tool if _PS_MODE_DEV_ is disabled

 - Profiling displays errors only if _PS_MODE_DEV_ is enabled (Previously, it override error managment)
 - Removing obsolete functions
// productcomment.tpl: wording + punctuation

+ h2 title removed
// Admin products prices form-group alignment
[-] FO : FixBug #PSCSX-3652  - Wrong summary cart percent
// Supplier::getProducts() improvements
// shopping-cart.tpl: punctuation

Remove unwanted ':'
Merge pull request #2211 from AlexEven/patch-3

// shopping-cart.tpl: punctuation
// ProductSale::getBestSales() improvements
Merge branch '1.6' of github.com:PrestaShop/PrestaShop into 1.6
// ProductSale::getBestSalesLight() improvement
// Manufacturer::getProducts() perfs improvement
[-] BO : Fix bug #PSCSX-3671, products on scenes
Merge branch '1.6' of ssh://github.com/PrestaShop/PrestaShop into 1.6
// Norm
Merge branch '1.6' of ssh://github.com/PrestaShop/PrestaShop into 1.6
// change cart summary alignment part 1
// fix error when adding product form BO order
Merge branch '1.6' of github.com:PrestaShop/PrestaShop into 1.6
// change cart summary alignment part 2 & end
Merge branch '1.6' of ssh://github.com/PrestaShop/PrestaShop into 1.6