Name Change - Function Re-Org

Preparing to use DMRlink as a python module. The name needed to be
changed to not clash with the resource sub-directory, and functions
were moved into the main class that are intended to be changed in a
derived class.

DMRlink is now a functional module. I will be shifting ALL development
of "application" level features to other files with derived classes,
and dmrlink.py will ONLY include protocol update/fixes/etc.