Add double ReferencePoint::average_measurements(string mac_transmitter),
that allows to get the average of all the Measurements sent by a given
transmitter.
Add, as protected functions, get_all_measurements(string
mac_transmitter) and get_requests(string mac_transmitter), that do the
same as get_all_measurements(void) and get_requests(void), but filtering
on the transmitter of the packets.
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