 typical args: straight-10 straight-10.su su-params

 Computes Shashua and Ullman's saliency map
 Writes a saliency image into <outfile> (a VIS image)
 Writes the most salient curve into <outfile>_cur (a binary VIS image)
 Typical parameter file (expects each parameter to start a line):
  0      0/1/2/3/4/5: Input is a saliency map (0,5) or VIS image (1,2,3,4)
          Computation is the usual binary (1), tao's intensity (2), or Freeman's intensity (3)
  1      sigma for guassian smoothing (ignored if input is sal map)
  50     number of iterations (N)
  16     16/17/24/25: Number of discrete orientations is 16 (16/17) or is 24 (24/25)
          Also, iff odd (17/24) then reset gap penalty, rho, to 0
  50     length to trace (typically = the number of iterations)
  10     printmod. Prints iteration number after every printmod iterations
  1      0/1: Iff 1, then compute and print max saliency every printmod iterations
  1      0/1: Iff 1, when done print to stdout the elements on the most salient curve
  0      0/1: Iff 1, leave the bug from Shashua & Ullman's paper
  1        scale (multiplies element length)
  1      0/1: Print the saliency map to <outfile>.map

