WAD archiver.

[Philip D. Bober]

I was fiddling with an old RPG that uses the DOOM WAD format, and was 
about to write yet another WAD reader, when I realized that it'd be 
simpler to add an archiver for WAD into physfs.
It was actually easier than I expected, cause WAD is very similar to 
GRP, so I just modified the GRP code.
This will probably be only useful to people working with DOOM engine 
games, but I figured that GRP is pretty much the same way, so maybe 
it'll be handy.
Here's the patch to physfs.c and physfs.h, and the new wad.c.
(I wasn't able to add this to the configure scripts, I'm not that great 
with autoconf and automake.)


-Travis Wells
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