Remove dependency on sale_payment_method

I want to remove this dependency so we can use an automatic workflow
without using the payment methods.

A third module will surely be necessary.
Remove changes to the model payment.method
Remove what depends on sale_payment_method

It will be reimplemented later in a link module between
sale_payment_method and sale_automatic_workflow
Started to implement a test
remove dead code
stock.picking.out has passed away and methods have changed
Add a page for the Automation information
Deprecated comment
Test fails on the last assert

Because workflow_process_id is not propagated to the stock.picking
Check if invoice is generated and opened
Propagate the workflow to the picking

Test pass now