[FIX/IMP]: fix a problem of journal entries (remove selection widget on period_id)

[IMP]: implement name_search for account move 
[IMP]: implement on_change_date for account move line, it will change the period
[FIX]: now it is possible to link existing lines with existing move -> remove readonly attribute on move_id under object account.move.line

bzr revid: mga@tinyerp.com-20100812201733-s0os5160atacra6e