[IMP] sale: use read_group instead of search_count
[IMP] sale: use read_group instead of search_count

Particularly for computed fields displayed in the kanban.

dfang/odoo,dfang/odoo,ygol/odoo,hip-odoo/odoo,dfang/odoo,dfang/odoo,ygol/odoo,ygol/odoo,hip-odoo/odoo,hip-odoo/odoo,ygol/odoo,hip-odoo/odoo,dfang/odoo,ygol/odoo,dfang/odoo,hip-odoo/odoo,ygol/odoo,ygol/odoo,hip-odoo/odoo