[IMP] stock: picking type view
[IMP] stock: picking type view

- Only display the warehouse and location field when the user is working
with multi warehouses and multi locations.

- MRP defines a stock.picking.type on manufacturing order, so that you can
easily set the source/destination locations and benefit from seeing a
manufacturing vignette in the inventory dashboard. However, the
manufacturing orders do not use every options defined on this view,
specifically the return picking type, the barcode nomenclature and the
packs and lots. This commit hides these options when the vignette is an
MRP one (manufacturing code).

A cleaner patch would have been to adds attrs with an xpath from the MRP
module, but if another modules wants to add another vignette there will
be a problem, so we chose the easiest way here.

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