Added timeout to output buffers destined for USB
Fixed bugs in thermocouple code
Reallocated thermocouple pin numbers
Made Roland mill and inkjet support conditional and normally disabled
Fixed issue with thermocouple code messing up the timekeeping system,
which was suspected of causing the network to be unreliable
Added support for M577 (thanks chrishamm)
Merged in Dan's thermocouple support
Define serial port allocation in Pins_duet.h
Fixed some leaks of OutputBuffer objects under error conditions
The terminating newline character in a gcode response is now added in
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