[FIX] mrp, mrp_byproduct: updating the quantity of production orders fixes

When updating quantity, it should take use a similar
method as for generating the moves, but with
the quantity already produced (and posted) deduced.
The parameters for these method needed to be changed.

When all the moves are posted,
we should create the necessary extra moves.
If the quantity is put back to the quantity posted, it
might also need to delete moves.
In byproduct, it should take into account the subproduct factor.

When the quantity produced  on the work orders has reached the quantity to do,
it should not allow anymore to use the "Done" button on work orders, but
rather use the Finish button instead.  With the Update button on the manufacturing order
it is possible to do more.