Rewritten the comment for the RSSI kludge.
Followed recent changes with tests in radio transmission and reception states.
Followed changes in RSSI calculation when there's a jump in signal strength.

I carefully investigated the values that are changed by this patch and I
concluded they are correct in the sense that they represent the maximum
RSSI value at the requested simulation.
Revived old behavior for sending control messages up.
Changed interference tests for two above reception threshold signals.

Radio cannot switch to second signal while receiving the first.
Followed change that sends up frames even if there was a bit error.
Omnet5 fingerprints updated assuming they are correct because omnet4 fingerprint tests pass.