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 #60 from lepistone/bid-selection-improve-views

Bid selection improve views