Corrected constant that was causing bad encodings for diagonals
Forgot to fix original (unused) code
Made encodings for X, Y, and Z-plane normals exact
Added special case optimization
Eliminated conditional branching from decoding routine
ANSIfication
Broke standard.h into rtio.h, rterror.h, rtmath.h, and rtmisc.h
Handling of zero vectors in dircode.c and long long lseek fixes for holodecks
Changed instances of "int4" to "int32" and "int2" to "int16"
Various small changes to reduce compile warnings/errors on Windows.
Numerous bug fixes in new mesh code
Changed encodedir() so it never generates 0
Moved dircode.c and fixed prototype compiles in hd directory
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