* Minor code comment cleanups
* Minor documentation and docstring updates
* Fix twisted katcp server's on-connect inform messages to be consistent
with the selected katcp version
* Improve error messages when an invalid sensor sampling strategy is set
* Fix bug in event-rate sampling strategy where events were sent whenever a sensor
object is updated, even if the value is unchanged. Also fixes same
bug for the event sampling strategy, since it uses the event-rate
code for its implementation
* Work around potential CPU livelock when sending messages and the network
buffers are full by using timeouts. Problem will be properly solved when the
current networking code is replaced by twisted.
* Fixed some buggy logger calls
* Improve the handling of sensor removal from the sensor tree
* made server main event loop robust against disconnect race-conditions when
looking up the client connection object