xli security fixes

[Smarasderagd]

I've made some fixes to xli for security problems pointed out to me
recently.  A new snapshot is available:
http://pantransit.reptiles.org/prog/xli/xli-2005-02-27.tar.gz

>From the CHANGES file:

Fix a security problem in the faces loader, a security problem when
opening compressed files, and check for integer overflows in image data
size calculations.

Add support for bzip2-compressed files.

#include <assert.h> in png.c, not "assert.h" -- no idea why I did that.


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