ACQ: allow recv actions on copies from non-PO interface

ACQ: allow recv actions on copies from non-PO interface

* Allow PO actions on copies, like recieve, unreceive, and cancel from
  non-PO interfaces like the picklist UI and lineitem search interfaces.
  Instead of relying on whether the user is viewing a PO, use the status
  of each copy to determine which actions are appropriate to display.

* General cleanup and better arrangment of the copy actions hide/display
  logic

Signed-off-by: Bill Erickson <berick@esilibrary.com>