Change constraint on stock_production_lot
Change constraint on stock_production_lot

- used name, ref
- improve check in the wizard
- add migration script
- add sequence

splbio/openobject-server,ovnicraft/openerp-server,gisce/openobject-server,MarkusTeufelberger/openobject-server,MarkusTeufelberger/openobject-server,splbio/openobject-server,gisce/openobject-server,gisce/openobject-server,xrg/openerp-server,ovnicraft/openerp-server,vnc-biz/openerp-server,MarkusTeufelberger/openobject-server,xrg/openerp-server,splbio/openobject-server,vnc-biz/openerp-server