MANDELBROT_CUDA:
  CUDA version
  Compute the Mandelbrot set and save a graphic image of it.

  X range: [ -1, -0.6 ]
  Y range: [ 0, 0.4 ]
  Xnum = 1000 x Ynum = 1000 = 1000000 Pixels
  Maximum number of iterations = 200

  Compute time:
  Wallclock: 0.01 sec.
        CPU: 0.00 sec.

  Plot saved in file 'mandelbrot_cuda.pgm'

MANDELBROT_CUDA:
  Normal end of execution.