Adding Vendor code support for products. Initial Support, just editing on product editor.
Adding support for Vendor Codes at the Purchase dialog.
Entering a vendor code in the code inputbox will search also in the product vendor code. If one is found, the code corresponding the vendor code will be replaced.
It is a kind of shortcut.
Adding initial support for negative stock on squeeze. Correct Stock, InputDialog, Database fields modified.
Adding setting for allowNegativeStock. Adding support for selling when negative or zero stock level on a product -at lemon-.
Merge commit '4d1f5e8e4d0688b3e48de2dcdaa0d2b5a3873254' into ben2colima
Merge commit 'a7016d36dd74b41aa464dac551811b300b68c4cb' into ben2colima
Merge commit 'a1233eb4e70c6722007d0c26a03507688409ecfc' into ben2colima