Revision 623

Beginning of a fully cross-platform (win32+intelc, linux+g++, altix+intelc)
scons build system
WORK IN PROGRESS NOT COMPLETE
+Incorporates ideas from trunks scons build system and the RW_WIN32 branch
+New Header layout as include/<modulename>, hence the changes to the headers
+Not all modules or features from trunk build system are fully implemented
-Removes need for intermediary SConstruct files - the top SConstruct is more complex but handle cross-platform better AND the SConscript are a LOT simpler
and only differ slightly. It should be simpler to maintain
-Options are now handled via either a: config file supplied on command line, a config file in the scons/hostname_options.py, or as individual command line arguments
-Need help with options: scons -h will give you a list of options and their current settings