Erply API version 1.5.19

Field "date" added to API getProductStock. It is now possible to retrieve the inventory report for past dates as well.
Improvement in API calculateShoppingCart: Promotion "X items for $Y.YY" can now be combined with a manual discount.
New input field "baseDocumentIDs" added to API saveSalesDocument. This allows to associate an invoice with multiple source documents (eg. an invoice with multiple sales orders).
Field "cardName" added to API savePayment. This is a custom field for integrating with certain payment terminals.
Customer-specific changes in API call importProducts. (This is an undocumented API call, not for public use.)
Fixed: API saveProduct did not validate code uniqueness correctly if the code contained capital letters.