Both blanket orders and calls for tenders shared a good chunk of information
(namely, enabling the feature and purchase agreements types configuration), and,
at the same time, aren't complex enough feature to have their own page, so this
commit merged-s both pages under a new folder "manage deals" where another commit
will add 3-way matching later on. At the same time, some of the content had to be
updated for v14 and it was necessary to provide slightly more in-depth information
across the board.
