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entry variable: $uplabel -- ROI/label file (BRIK)
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default: */<scandir>/MY_AREA+orig.BRIK

The "roiup:" entry shows the name of the current
upsampled-resolution 3D ROI/label (usu. not
loaded at startup).  This label will typically
have been previously generated by tkmedit (using
the "W" button on the "roiup:" line, for time
course extraction, or masking).

The current session directory can be abbreviated
as an asterisk (*). Absolute name OK, too.
Relative name appended to current scandir.

The ROI/label file is a 256^3 (or 512^3) short
(2-byte) AFNI BRIK with a voxel value of 64 to
indicate where the filled/connected label is and
0 elsewhere.

The ROI/label file is currently used it two ways:

 (1) fill ROI, then use it to extract raw data
      timecourse with "T" button on "roi:" line

 (2) fill ROI, then use it to mask overlay
      activations outside of ROI ("m" check)
