* [NOD-1123] Bubble bad-message errors up to the protocol level.
* [NOD-1123] Implement Banning.
* [NOD-1123] Properly use &stopped.
* [NOD-1123] Ban by IP rather than IP and port.
* [NOD-1123] Don't initiate connections to banned peers.
* [NOD-1123] Fix infinite loop in checkOutgoingConnections.
* [NOD-1123] Fix bannedAddresses key.
* [NOD-1123] Rename onBadMessageHandler to onInvalidMessageHandler.