Entropy TODO
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- Split MSG_BCM (broadcast message) into three parts: MSG_BCA, MSG_BCR and MSG_BCI for "brodcast advertize", "broadcast request" and "broadcast insert". This will reduce the size of messages travelling every node, probably several times, to the 30 bytes of a MSG_BCA. A node will then request the broadcast itself only if it doesn't already have it.

- Get rid of the constant key encryption of MSG_FPR and MSG_ANN messages. It just doesn't make sense to encrypt the gzipped buffer, since it is transferred over an encrypted link anyways. Removal has to be done with backwards compatibility, i.e. compare build number of peer node and decide if or if not to encrypt the message. Same on receipt of such messages.

- Create views (PNG or GIF) for the more detailed statistics for bandwidth per hour and day, which are currently collected but not used anywhere. Perhaps add per node bandwidth display (now collected for 60 seconds, could be extendend by 60 minutes stats and 24 hours stats).

