Continued ANSIfication and reduced compile warnings.
Updates for 3.5 release
added stdlib.h for better reliability on some systems
small cleanup suggested by Philippe B.
added fh entity and general cleanup
made some support handlers external symbols
made it so the stored input line includes escaped newlines
added error for unmatched xf or o context close fixed potential bug in mg_load() in case MG_OK != 0 in future
added check for input line exceeding MG_MAXLINE
fixed bug in e_cone
added default handling of undefined entities
precautions against 16-bit architectures
bug fix for empty include files
added material index of refraction
reduced significant digits in spectrum output
added cct entity
added surface normal interpolation to prism's
added "sides" entity for one- vs. two-sided surfaces
made the -a (array) option work within files as well
bug fixes and enhancements
minor fixes and enhancements
minor bug fix
added cspec and cmix entities
changed prism length from first argument to last
added prism entity and minor changes
more bug fixes
various enhancements and fixes
Initial revision
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