Tested and approved by Ray John Justin

Fixed Relay com problem (send as raw data, not ascii strings). Added
Current limit field. Manually checked recorded data against output file.
Fixed error in header (voltage row was too high). Thermal chamber goes
back to 25 degrees after test.  Power supply and relays turn on during
initial soak.  Measurement shows up on front screen.  Message reads
(Click ok to start test) now.