[FIX] crm_partner_assign: allow to pass several ids to assign_partner
[FIX] crm_partner_assign: allow to pass several ids to assign_partner

In previous code, for each lead, that allocate the saleman for all the leads (ids).

So n^n, 100 leads = 10000 allocation/write in db

sysadminmatmoz/OCB,bplancher/odoo,sysadminmatmoz/OCB,Elico-Corp/odoo_OCB,dfang/odoo,laslabs/odoo,sysadminmatmoz/OCB,storm-computers/odoo,ygol/odoo,ygol/odoo,microcom/odoo,storm-computers/odoo,bplancher/odoo,dfang/odoo,laslabs/odoo,hip-odoo/odoo,bplancher/odoo,storm-computers/odoo,microcom/odoo,ygol/odoo,ygol/odoo,storm-computers/odoo,microcom/odoo,bplancher/odoo,laslabs/odoo,hip-odoo/odoo,ygol/odoo,hip-odoo/odoo,laslabs/odoo,microcom/odoo,sysadminmatmoz/OCB,dfang/odoo,ygol/odoo,Elico-Corp/odoo_OCB,hip-odoo/odoo,storm-computers/odoo,laslabs/odoo,ygol/odoo,bplancher/odoo,dfang/odoo,Elico-Corp/odoo_OCB,laslabs/odoo,microcom/odoo,Elico-Corp/odoo_OCB,storm-computers/odoo,Elico-Corp/odoo_OCB,sysadminmatmoz/OCB,sysadminmatmoz/OCB,Elico-Corp/odoo_OCB,bplancher/odoo,hip-odoo/odoo,dfang/odoo,sysadminmatmoz/OCB,hip-odoo/odoo,microcom/odoo,dfang/odoo