Fix rule to have the same behavior if no global than the access control.
Fix rule to have the same behavior if no global than the access control.

Global=> AND (restrictive)
Group/User=> OR (take the best)

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