Started designing atom ops.  Removed some long-done tasks.
Added description of DAC for high voltage level.  Cleanup.
Updating and cleanup.  Need to redo timer/counter comparator assignment.
Added pullups to limit switches.
Deprecated INIT_PULLUP_PIN().  Use INIT_INPUT_PIN() for pullups.
100% cosmetic.
Merely added a comment about needing limit switch faults.
Fixed a typo.  softinit -> softint.
First draft of queue API and implementation.