[ADD] git ignore file
[ADD] move stock_prodlot_lock from our private repo

OdooMRP is developping the same feature in https://github.com/odoomrp/odoomrp-wip/pull/376
@pedrobaeza asked me to share our module so we can converge

Relicensed as AGPL3
Fixed PEP8 compliance and minor bugs
[FIX] Do not hide lots when active_test is false

There was a problem in the way we were hidding lots from the users: when users create prodlots, the client calls search(... [('id','=',<id of the new record>)]. Since we were hiding the lots as soon as the lock checkbox was checked, search() returned False which the client didn't expect.
Fixed by letting search return locked lots as the context also asks it to return the inactive lots, which the client does when new records are created.
[REF] Code cleanup