:0.0.1: Initial module.
:1.0.0: Add Multi Company ability
:1.0.1: rename product creation methode
:1.1.0: Make validity_date persistent, add batches to SO views
:1.1.1: Remove validity date
:2.0.0: Move product logic to sale order lines
:2.1.0: Add "In Progress" and "Cancelled" state
:2.1.0: Add invoice status and menues