NEW Introduce mass action on product list ('delete' for the moment)

ChangeLog

htdocs/categories/viewcat.php

htdocs/commande/list.php

htdocs/product/card.php

htdocs/product/class/api_deprecated_product.class.php

htdocs/product/class/api_products.class.php

htdocs/product/class/product.class.php

...cs/product/dynamic_price/class/price_expression.class.php

htdocs/product/dynamic_price/editor.php

htdocs/product/list.php