[FIX] mrp_mps, product: we need to be able to calculate stock in the past for the MPS

When calculating the stock quantity fields, we can put a
from/to_date in the context.  This should work in the past too.
We see the to_date as the date in the past to calculate and calculate
backwards from the stock now to the date in the past.
This is done by doing an extra read_group on the stock moves,
with a similar domain except that it takes the moves done from
date_to.

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