Test Equity Model 140

Driver stack for the Test Equity Model 140 thermal chamber.  The driver includes the ability to set the temperature setpoint, read the temperature setpoint and read the actual chamber temp.  I implemented the humidity and part temperature items as well, but they are there to help implement other models (i.e. not tested for functionality).  The Model 140 is a temperature controlled only unit. 

The driver is implemented with a base driver for all of the Test Equity machines based on the Watlow F4 controller, with a specific driver for the Model 140.