Improve speed of Move.assign_try
The search of child_of inside a loop could be cached as the odds are high to have most of the time the same from_location.
The write and assign could be performed all at once at the end as the written move value are not read back.
Unfortunately, we can not group the copy call but in normal usage there should be not too much call otherwise it means the warehouse is in complete random state.
See https://groups.google.com/d/msg/tryton/qwbDmFEZRyc/AfrVNQVoBgAJ