* adding aqcontracts, that will contain contracts attached to a given bookseller. Each basket can be attached to a contract
* adding columns to aqbasket: basket name, note, booksellernote and contractnumber
* adding column to aqorders: uncertainprice, budget_id and statistical fields
* adding table aqbasketgroups: will be used to collate X basket into a single basketgroup
* adding table aqbudgetperiods: will be used to manage budget periods, 1st step to define a budget
* dropping & re-creating a aqbudgets table: completly new content, no update from previous acq
* adding table aqbudget_planning table: will be used to store library budget planning (by ccode, branch, month, and other authorised_values)
* adding column to currencies table: active, that will tell which currency is the used one.
* adding sub permissions for acquisitions module
* adding column to booksellers table: gstrate that will tell the gst rate for the bookseller.
* adding sysprefs: AcqCreateItem (define when item creation is done ordering/recieving/cataloguing), CurrencyFormat
* adding aqordersitems table: link between order and items
* dropping aqorderbreakdown: useless
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