Program for DM32/DM42 clock cal

[ab3ap]

I wrote a program to generate a clock calibration file for the SwissMicros DM32 and DM42 (maybe others?). Info is at https://udel.edu/~mm/hp/clockCal/ if you'd like to try it. I'd appreciate bug reports but believe it's working. You run it once to start a measurement and after several days run it again to end the measurement, when rtccalib.cfg is created.

I thought it would be only slightly more time to write a program than do the calculations by hand. Several hours later, the program was written and tested. So much for my programming time estimate! :-)