[IMP] Update module descriptions of procurement and product_extended + _bom_find...

[IMP] Update module descriptions of procurement and product_extended + _bom_find and properties

Module description of procurement was deprecated (talking about mrp, ...) and in product_extended
it described things not implemented in the module.

In _bom_find, we passed a UoM which was not used in Saas-4 and it would not be logical that you
need to select a BoM that matches the UoM, so I removed it.

In the demo data, there was still a push rule which triggered a move from output to pack.  The copy=False
is correct for production_id when you would have these push rules.

For the properties: we want to allow to take a bom which has no properties, but only when there is no other
BoM matching the properties we pass.

Update module descriptions

[IMP] production_id copy + no round

[IMP] _bom_find without uom, property correction