Remove code for obsolete systems.
Prepare for SCons build on Win32 and Win64
Minor fix
Made quitting rvu, rholo and rcontrib quicker with multiple processes on Unix
Added binary flag to i/o descriptors (needed in this case?)
Minor fixes that should not affect operation
Simplified creation of child process
Removed SPEED from SCons. Changes to build with mingw, as suggested by Francesco Anselmo.
Compatibility fixes as suggested by Siegbert Debatin.
Various platform compatibility fixes.
Moved some more platform dependencies to common header files. Included a few necessary system headers.
Reduced compile problems on Windows.
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