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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