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tcl funct: readnativemask -- read native mask
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keyboard equivalent: none

The "R" button reads a native resolution
(typically EPI) mask stats file (bfloat or float
BRIK), registers it to the structural, and
upsamples it to the structural resolution.

To save the upsampled file (for example, after
smoothing), first click the bold label to change
the entry labeled "mskn:" to "mskup:".

The functs used by the readnativemask tcl wrapper
are:

  forcebrikMSBfirst
  read_native_stat 2
  do_regupsamp_stat
