[IMP] Add purchase order optimization
[IMP] Add purchase order optimization

Remove purchase/schedule date of cadencier + group.  Should work through inheritance in stock_calendar.

microcom/odoo,Elico-Corp/odoo_OCB,bplancher/odoo,Grirrane/odoo,bplancher/odoo,sysadminmatmoz/OCB,stephen144/odoo,deKupini/erp,microcom/odoo,dfang/odoo,stephen144/odoo,sysadminmatmoz/OCB,tvtsoft/odoo8,bplancher/odoo,tvtsoft/odoo8,cdrooom/odoo,sysadminmatmoz/OCB,OpusVL/odoo,alhashash/odoo,bplancher/odoo,ygol/odoo,optima-ict/odoo,bplancher/odoo,alhashash/odoo,addition-it-solutions/project-all,mkieszek/odoo,ygol/odoo,Grirrane/odoo,alhashash/odoo,tvtsoft/odoo8,storm-computers/odoo,odoousers2014/odoo,microcom/odoo,hip-odoo/odoo,odoousers2014/odoo,stephen144/odoo,laslabs/odoo,alhashash/odoo,Elico-Corp/odoo_OCB,syci/OCB,stephen144/odoo,deKupini/erp,mkieszek/odoo,sysadminmatmoz/OCB,hip-odoo/odoo,cdrooom/odoo,mkieszek/odoo,syci/OCB,deKupini/erp,laslabs/odoo,ygol/odoo,Elico-Corp/odoo_OCB,optima-ict/odoo,storm-computers/odoo,dfang/odoo,syci/OCB,tvtsoft/odoo8,alhashash/odoo,hip-odoo/odoo,mkieszek/odoo,optima-ict/odoo,deKupini/erp,bplancher/odoo,dfang/odoo,Elico-Corp/odoo_OCB,Elico-Corp/odoo_OCB,Grirrane/odoo,sysadminmatmoz/OCB,cdrooom/odoo,laslabs/odoo,storm-computers/odoo,odoousers2014/odoo,cdrooom/odoo,laslabs/odoo,storm-computers/odoo,addition-it-solutions/project-all,microcom/odoo,microcom/odoo,dfang/odoo,optima-ict/odoo,microcom/odoo,syci/OCB,odoousers2014/odoo,laslabs/odoo,mkieszek/odoo,ygol/odoo,ygol/odoo,tvtsoft/odoo8,stephen144/odoo,syci/OCB,addition-it-solutions/project-all,ygol/odoo,dfang/odoo,ygol/odoo,hip-odoo/odoo,deKupini/erp,Elico-Corp/odoo_OCB,dfang/odoo,addition-it-solutions/project-all,optima-ict/odoo,storm-computers/odoo,alhashash/odoo,OpusVL/odoo,storm-computers/odoo,Grirrane/odoo,sysadminmatmoz/OCB,optima-ict/odoo,Grirrane/odoo,Grirrane/odoo,hip-odoo/odoo,odoousers2014/odoo,syci/OCB,addition-it-solutions/project-all,mkieszek/odoo,tvtsoft/odoo8,OpusVL/odoo,stephen144/odoo,laslabs/odoo,addition-it-solutions/project-all,OpusVL/odoo,odoousers2014/odoo,hip-odoo/odoo,sysadminmatmoz/OCB