This is a standalone version of the image codec which will eventually be
used in rk (once it is stable enough).

Accepts only 8-bit or 24-bit TARGA format images.

Please note that this is only a test program so use it at your own risk.

Changes:

8/1/2000 - Version 1.06
  Now detects a standard grey scale palette and uses the grey scale
  compression routines instead of the default palette routines.

6/1/2000 - Version 1.05
  Added support for BMP files.

30/12/1999 - Version 1.04
  Created a mode for 8bit paletted images.
  Created new algorithms to handle artificial and simple images.
  No longer an 'archiver', only guarantees lossless compression of the
  image data, not header information.
  No longer handles RAS files, maybe later...

20/6/1999 - Version 1.03
  Fixed a typo that was stopping it from decompressing 90% of all colour
  images using 'cx' mode.
  Tightened up the RAS type checking so that it now complains when given
  an RAS file that is not of the correct format.
