Improvements to byte2node

Improved how byte2node value is determined and passed to listeners.
Replaced "buf" & "b" use with "dis" & "d", "Creating" log statement now
states type as well as name. Moved numerical content check to
_verify_frame and cast str's to int's for decoding instead (temp
measures as decoding will be changed), logged rfm setttings info uses
actual listener name .
Merge branch 'byte2node' of https://github.com/pb66/emonhub into byte2node