Log Message:
Update dcraw to 8.13

* Fixed camera WB for Canon EOS 10D, 300D, and clones.
* Added the Leica D-Lux 2.
* Added the Leaf Aptus 75.
  Correctly handle the DNG AsShotWhiteXY tag.
* Better support the Imacon Ixpress 22-Mp.
* Don't search for the best black value in colorcheck().
  Added new color matrix for the Nikon E700, E800, and E950.
* Added getreal(), and use getint() more often.
* Use unmagnified dimensions in write_ppm16().
* Support the Olympus E-330.
  Added "-D" option to output unscaled raw pixels.
  For DNG, support ICC profiles and short AsShotNeutral tags.
  Fix defective pixels and columns in Phase One images.