LokiHack '99 Patch

Patch Title: enabling of gziped TGA file reads
Author: Roberto J Peon
E-mail: fenix@cc.gatech.edu

Short Description: Modifications allow code to read both *.tga and *.tga.gz

Long Description:  MOdified the TGA utils code to use zlib's gzopen, etc
		   tools. Modified various other parts of the code pertaining
		   to searching for files, allowing the code to look for
                   a *.gz when none of the default extensions were found,
                   and then strip off the .gz, and verify that the file is 
                   a known type. (and read it, of course! but only for tgas
		   until the fopens are converted to gzopens. See Bugs below.)

                   if it is a known type, it is reported as found in that dir,
		   but the name is unchanged. Hacks exist in the TGA utils to
                   automaticaly look for tga.gz when attempting to open .tga
                   fails. (or vice versa, I don't remember which. Gist is that
                   it will handle either.)

Documentation:     see above and below.

Known Bugs:        rest of fopens in rest of code needs to be changed to use
                   zlibs gzopen (etc) so that the hacked framework can be used t
		   load a compressed version of any of the known file formats.
		
		   There is some "useless" code in radarmap.cpp and
                   in turncount.cpp, which will not affect anything, but I 
		   didn't have time to remove. You are welcome to remove it.

		   additional: the rotate_bitmap function that I added
                   to radarmap should work, but is untested. 

		   I was unable to "turn on" that code because Buffer()
                   apparently returned a non-valid pointer (null) and the surf
		   should have held a valid value (it is used for blitting 
                   later!!)


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