Invoices: work flow for invoice needs more options

[dsajdak]

Currently an allocation with a status of "payment requested" or "payment pending" displays in the list of invoices. The only way to move it back to the view of "pending allocations" is to change the status to "paid" or "payment declined" There should be other paths forward to get it removed from the invoice list and visible under the pending allocations list again. Options like "on hold by center" "on hold by PI" or "cancelled by PI"