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entry variable: $angle_cycles -- adjust phase colscale
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default: 2.2

The "anglecycles:" entry (on lower right of fn-F2
panel) adjusts phase color scales.

Integral values (1,2,3) result in one or more
red-green-blue wraps of across 360 deg of phase.
Non-integral values result in one red-green-blue
cycle (e.g., 2.2 is one cycle slightly tighter
than 2 cycles per 360 deg).  Phases just beyond
that are clamped to the ending colors while
phases opposite the center (blue) approach gray.
