Log Message:
Changes 1.2.0:
* Added the -grs_longitude option, to specify the longitude of
  Jupiter's Great Red Spot, in System II coordinates.  This assumes
  the Jupiter image has the center of the Great Red Spot at pixel 0
  (at the left side of the image) in order to draw it at the right
  position.
* Added the Icosagnomonic projection, contributed by Ian Turner.
* Fixed a bug where output filenames had an extra digit in some cases.
* Added the bump_map and bump_scale options in the configuration file.
* Added the -glare option to set the size of the sun's glare.
* An image map may be specified for the sun in the configuration
  file now.  A shade value is now required for the sun (should be
  100, otherwise the sun will have a night side!)
* Added the -arc_spacing option to set the default angular
  distance between great arc points.  It used to be 0.1 degree, so
  arcs smaller than this wouldn't get drawn.
* Fixed a bug where markers were not aligned properly when using
  align = "above" or "below".
* Added warnings if options are specified in the [default] section
  of the configuration file that probably shouldn't be there.