LP1929741 Bundle of ACQ bug fixes

LP1929741 Bundle of ACQ bug fixes

* 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.

Signed-off-by: Bill Erickson <berickxx@gmail.com>
Signed-off-by: Galen Charlton <gmc@equinoxOLI.org>
Signed-off-by: Jane Sandberg <js7389@princeton.edu>