reactivate module sale_sourced_by_line
port sale_sourced_by_line to 8.0

Now allows to set a warehouse on sale order line

Added a test for sale order with multiple warehouses sources
move warehouse_id above route_id field in view
improve warehouse help tooltip
Add POT file
bump version
put default warehouse_id of sale order in warehouse_id of sale order line
try to test sale_sourced_by_line separately
Merge pull request #49 from yvaucher/8.0-port-sale_sourced_by_line

8.0 port sale_sourced_by_line module
Allow to chose the source location by SO line. Compared to v7.0 version, we'd change the location_id to warehouse_id to be consistent with new WMS