Comment 3 for bug 1929741

Pushed a number of updates based on the recent ACQ working group session:

* Distribution formula combobox now displays entries on click
* Ditto Charge Type combobox
* Items now vanish when deleted
* Estimated amount, etc. update when items are added/deleted
* Lineitem action links match order of previous interface.
* PO dry run checks now fire after a brief record is added
* PO activation is blocked if an item has no owning lib.
* Apply default lineitem order identifiers
* Indicate when multiple order identifiers exist