[IMP] kanban :- improve sort_group method.
[IMP] kanban :- improve sort_group method.
splbio/openerp-web,gisce/openerp-web,splbio/openerp-web,vnc-biz/openerp-web,gisce/openerp-web,MarkusTeufelberger/openerp-web,vnc-biz/openerp-web,splbio/openerp-web,MarkusTeufelberger/openerp-web,vnc-biz/openerp-web,gisce/openerp-web,vnc-biz/openerp-web,MarkusTeufelberger/openerp-web