Analog Spindle

[Kurtis Martineau <klmartineau-at-shaw.ca>]

A look through ../emctask/minimilltaskintf.cc  will reveal that some code
has been written to allow a dac to be configured to run an analog spindle.

SPINDLE_ON_INDEX  for which dac. (ie. 3 for the fourth)
VOLTS_PER_RPM for obviously how many volts to output for every commanded
rpm.(ie. 0.001 for 1volt per 1000 rpm)

I don't get any analog ouput from:
M3 S1000
I do get the clockwise direction bit to toggle.  (M5 to stop, M4 for
counterclockwise)

What do I need to do in order to get the analog spindle output?
Could this be brought over to work with bridgeporttask?

Maybe a new name for the bridgeport stuff if any modifications are to be
done;  something machine independant.

Kurtis