Fix Typo in _zone_action tracking, allow for subsequent setpoint messages
Add Documentation to Existing Code
Test out Extended Message for Mode
Merge branch 'insteon_thermostat' into running
Create simple_message(), Use for all subs that set data

simple_message() is a stop-gap to bring support of i1, i2, & i2cs thermostats up to the level provided before Insteon Redux.  This should allow for quick merging into the stable codebase before release 3.0.

Next steps will be to split the thermostat class into an i1 and i2 class.
Merge branch 'insteon_thermostat' into running