* keept description of planned orders verbose.
* make it translatable in most cases.
* while grouping demand include the product in the description.
* add `origin` field not mrp moves and planned orders. Fill it
with top level demand origin.
* Add menu entry for planned orders
* Add button to navigate from planned orders to linked manufacturing orders
* Add action to convert planned orders to fixed
* When changing the due date in a planned order the release date is recomputed