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switch variable: $colscale -- funct color scale
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switch value: 6 => blu/red to white (real data)

The "BR" (blue/red -> cyan/orange -> white) color
scale is for real-valued, possibly signed
statistics.

Red is positive and blue is negative, which can
be reversed by ticking "rev" (set $revphaseflag
to 1).

As significance increases, scale goes from
blue/red to cyan/orange to white/white.

Not affected by $angle_offset, $angle_cycles, or
$invphaseflag.

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Alt (mid-click): shortcut to get "vd" w/o fn-F3
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Middle-clicking the "BR" button switches to the
"vd" CARET videen-style wheel (colscale=17)
without having to use the the "Col:" popup or the
extended (fn-F3) panel.
