Continued ANSIfication, and other fixes and clarifications.
Eliminated copystruct() macro, which is unnecessary in ANSI. Reduced ambiguity warnings for nested if/if/else clauses.
Added prototypes and includes from patch by Randolph Fritz. Added more required includes and reduced other compile warnings.
Instrumented headers against multiple inclusion and for use from C++. Moved includes in headers out of "C" scope.
Replaced most outdated BSD function calls with their posix equivalents, and cleaned up a few other platform dependencies.
Broke standard.h into rtio.h, rterror.h, rtmath.h, and rtmisc.h
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