Board revisions for easier assembly of next batch.
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Makefile switched to atmega168 default, for more recent boards. Added profile for Stryfe.
main.c: Added a 10ms delay after updating mixes. This reduces glitches in fast-changing outputs.
mixer.h: corrected numbering is comment.
pwm.c: correctly turn off PWM pin when value is 0.
Updated/working Stryfe profile.
Better named settings enums.

* Analog Out enum is now OUT_*
* Multiplex enum is now MP_*
* Logic functions now have an enum instead of having hard-coded constants. They are OP_*. OP_AC_* use one analog and one constant, OP_AA_* use two analogs, and OP_DD_* use two digitals.
Mixer updates to add Edge Detectors, and other minor changes.

* Add edge-detectors as switch types.
* mixOuts is now sized by NUM_MIXOUTS, which is the last value in the enum.
* Named vars OUT_VAR1-4.
partial work on RS burst mode.