[FIX] stock: consolidate merge quant

It could exist issue with concurency. If the user try to
open the inventory menu but the database can't obtain the lock
for quants to modify/delete. It could raise a traceback to the
end user.

In order to prevent that we use a try catch and pass the exception
it's okay if all the quants are not merged for the user, it will
probably be the next time. It also use a savepoint in order to not
rollback the whole transaction.

The merge quants was only used once the user click on inventory
menu. But if the user only do it once every 2-3 years, there could
be too much quants to merge in only one transaction. In order to
avoit it, we also deduplicate quants in the scheduler cron.

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