[FIX] analytic: name_search on accounts

The name_search was hardcoding ilike operator while it could be different. This means that a name_search "name != Agrolait" would return accounts with agrolait.
A side effect of this was the impossibility to import account_analytic_account whose parent is a substring of another - opw 607315
[FIX] stock: onchange method should take the description

The onchange_product_id method used to only change the description if the stock.move is not saved yet. That does not make much sense.
opw 607347, bug lp:1314700