Changed to using _popen and _pclose under MicroSoft VisualStudio
Compatibility fixes as suggested by Siegbert Debatin.
Created our own RT_PID instead of hijacking pid_t on Windows.
Reduced compile warnings, and other compatibility fixes.
Replaced all calls to vfork() with regular fork() calls
Removed redeclaration of fork() call + vfork.h header, using rtprocess.h instead
Added gethomedir.c and various compatibility fixes.
Various platform compatibility fixes.
Instrumented headers against multiple inclusion and for use from C++. Moved includes in headers out of "C" scope.
Moved some more platform dependencies to common header files. Included a few necessary system headers.
Broke standard.h into rtio.h, rterror.h, rtmath.h, and rtmisc.h
Abstracted process and path handling for Windows. Renamed FLOAT to RREAL because of conflict on Windows. Added conditional compiles for some signal handlers.
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