gdk-pixbuf ppm bug and tga update

["Terry 'Mongoose' Hendrix II" <stu7440 westga edu>]

There is a bug in the ppm ascii loader that loads extra data into the
image, causing a shift in scanlines.  I will release my TGA loader with
a true progressive loader and submit the patch for ppm later this week
after finals.  =)

I don't know what's wrong with the PCX, so i'm going to put it through
my pibmap driver and see.  If anyone wants to request image formats,
please feel free -- I have quite a few loaders already written and ready
to port from GL.  ;) 

cheers,
Terry

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