For each MRP Parameter or for each Product in a MRP Area, we will be able to add a MRP Planner. Once this planner is set, he can filter himself in the MRP Parameters view, MRP Inventory view or MRP Planned Orders view.
* 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
