docs: def nii_ugzip(imfile, outpath=''):
      '''Uncompress *.gz file'''
      import gzip
      with gzip.open(imfile, 'rb') as f:
          s = f.read()
      # Now store the uncompressed data
      if outpath=='':
          fout = imfile[:-3]
      else:
          fout = os.path.join(outpath, os.path.basename(imfile)[:-3])
      # store uncompressed file data from 's' variable
      with open(fout, 'wb') as f:
          f.write(s)
      return fout