Improvements to "byte2node"

Improved how byte2node value is determined and passed to listeners.
Replaced "buf" & "b" use with "dis" & "d", "Creating listener..." 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 .