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switch variable: $colscale -- funct color scale
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switch value: 1 => pos heat scale (complex data)

The "ht" (heat) color scale requires
complex-valued data.  It runs from dark brown to
white.  If "trunphase" it unticked
($truncphaseflag is 0), it displays any brain
region significantly activated in a periodic
fashion (i.e., it ignores phases).

Ticking "truncphase" causes half of the phases to
be truncated.  The "angleoffset" entry
($angle_offset) controls exact half that are
truncated.

The $angle_offset for two condition expt with 20s
ON and 20s OFF should be approximately 0.1 (this
is in units of one cycle: 0.1 * 40 sec = 4 sec
delay).
