Code now ready for regression testing with new Message() wrappers added

Refactored usages of raw message to use Message() ...

Removed all usages of showMessage, alterMessage

Marked with ##HERE markers the refactoring required for new Message() ...

Disabled alterMessage showMessage and createMessage to force this issue

OpenThings.Message tests now completed

PARAM_NAME key syntax for OpenThings.Message [set] tested ok

OpenThings.Message now tests attribute set and get. ...

Added decorators for @test_0 and @test_1 to turn tests on and off selectively

setattr tests done on OpenThings.Message

OpenThings.Message test harness keyed paths tested and working

Started writing unittest harness for new OpenThings.Message abstraction

Message.get() implemented and tested with paramid keying

Started to think through a better message abstraction

Started to think through a better alterMessage ...

characters that can be used in an identifier need checking

Moved test harnesses into separate _test.py modules

Python 3 now supported. ...

Logger now stores apparent power and real power headings.
Logger now stores temperature from eTRV in csv file

Now displays receive time of incoming messages

Restructured switch.py so we have a tx-only test. ...

This is in preparation for pushing the FSK transmitter into radio.c

Started refactoring