Export features
Add crossed price in export
Handle empty product price
Check product status (two different cancelled status)
Compliancy with export orders modules
Fix small warning error
Update version + register on new hook + update "upgrade" method
Update configuration form
Synchronize stock on new order
Handle Sellermania webservices limitation
Remove debug line
Organize code
Check the case if we can't find any sku
Update Sellermania quantity when a quantity is changed in PS (only for product with attributes)
Add Sellermania Import Orders flag (to avoid stock sync when it's a Sellermania order)
Update Sellermania stock when a quantity is changed in PS (for products with and without attributes)
Add code comment + check if SKU is empty
Add one security condition
Make stock synchronization compliant with PS 1.4
Small fix for PS 1.4