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tickbox variable: $smoothoverlaymaskflag -- toggle smooth mask
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default: 1 (TRUE)

The "m" tickbox at the upper right side of the F2
panel under the SMOOTH STATS button toggles
$smoothoverlaymaskflag.  This controls whether
the overlay mask will be smoothed when SMOOTH
STATS is clicked.  Default is ticked.

If unticked, when smoothing is applied to the real
or complex data, the stat mask will *not* be smoothed.

N.B.: no effect if stat mask not loaded

N.B.: no effect if structural scan loaded
