prohibits inter-facility redirects (which should return a ILL TRK error), prohibits redirecting to the controller who initiated the handoff (which should return a ILL POS error)
only shows "RD" to the original owner, last redirector and the redirect target
"RD" is removed after the RD is accepted for everyone, except the original owner, who will see "RD" for about ~30 seconds or until clicked
shows sectorID as a handoff target in the datablock, instead of just a P/R
when a RD is accepted, flashes the datablock to the original owner and makes them acknowledge it (similar to normal handoffs)
only allows the latest redirector to recall the RD
forces FDBs for all the redirectors even after the RD is accepted
if the handoff itself is cancelled, clears the RD
if the 2nd redirector RDs back to the 1st redirector forces a PDB, clears the RD to show it as a normal handoff
Addresses #214.