wizard view is there, more work needed to customize the procurment handling

+ flake8 clean of sale_order

remove travis_run_flake8
set a separate env for testing sale_quotation_sourcing, and it seems that
another addon is changing a return value which makes our tests unhappy

once sale_exceptions is fixed, not need for 4 environments

Apparently, MTO rules are have action="move". With this change, we do
generate an outgoing picking when the SO is validated.

In a MTO case, two procurements are generated, and it is the second one
that is to be attached to the purchase order

The goal of the game is to make the manually sourced case behave exactly
like the standard automatic one.

the presence of sale_exception_nostock breaks the tests of
sale_quotation_sourcing

Use the name_search instead.

A new one is coming, so I am adapting the existing tests.

This check is done when the procurement is processed, which happens when
the Sale Order is validated. We cannot easily check before validation
because we need to know what destination location has been chosen in the
procurement. Just checking the route selected in the Sale Order Line is
too restrictive because the Route can be chosen in many other places.