Additional fixes for MINGW thanks to Guy Vaessen
Updated SConscript files for compiling under MINGW
Removed duplicate installs and added dctimestep
Adapting to move of ezxml.c to common and removal of mkillum4.c.
Yet some mingw related changes.
More fixes for mingw build/install.
Scons update for mingw.
Added mksource to SCons build, fixed some compile warnings.
Updates to SConscripts for 3R7.
Compatibility fixes as suggested by Siegbert Debatin.
SCons build simplifications.
Renamed gencat to gencatenary.
Experimental SCons update: Debug builds, split libraries, more Windows targets.
Checking in experimental SCons build environment.
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