new module purchase_delivery_address

The new delivery address in the purchase order is propagated to
the picking.
mto dropshipping: propagate address so->po
travis: split purchase_delivery_address
adapt to the existing dest_address_id field
update description
propagate the supplier as well

See the updated README for more infomation about the new logic. The idea
is to have in the picking information about both the supplier and the
customer address.
The test test_propagate_supplier_and_chosen_address_to_picking show also
clarify what is going on.
fix get_cheapest_agreement_for_qty sorting
remove onchange picking type on purchase order

The removed code changed the destination address of the PO with the
address of the warehouse related to the picking type. That is bad for
two reasons:

- The dest_address_id is used for the customer address in dropshipping
  scenarios. That has nothing to do with the warehouse address.
- The dest_address_id has itself an onchange that sets the destination
  address to customers, because we are in a dropshipping scenario. Thus,
  this commit fixes #56.
Merge pull request #57 from lepistone/remove-onchange-picking-type

Remove onchange picking type on purchase order
search picking types on the same company
fix #58: inverted creation of rfq and bids

The module purchase_requisition_auto_rfq_bid_selection is just a bridge:
it should not change the functionality of bids and rfqs:

- an open call for bids should have bids
- a restricted call for bids should have rfqs

Installing the bridge module the two get inverted. This fixes it.

The yaml test was inverted as well: it is flipped, too.
bid selection PO: move conditions to new tab

The purchase order has many new fields: I move terms and conditions to a
new tab.
bid selection PR: move conditions to new tab

As done for the PO, also the PR has many fields, so I move the terms and
conditions to a new tab.
bump purchase_requisition_bid_selection
Merge pull request #53 from yvaucher/8.0-fix-52

fix get_cheapest_agreement_for_qty sorting
Merge pull request #46 from lepistone/purchase_delivery_address

purchase_delivery_address
Merge pull request #59 from lepistone/fix-rfq-bid-inverted

fix inverted creation of rfq and bids
Merge pull request #60 from lepistone/bid-selection-improve-views

Bid selection improve views
Fix separator name for PO line field remark
add new module purchase_delivery_address

This is an extraction of dest_address_id field from module
purchase_requisition_bid_selection