Updating to SCons 3.x, adding support for Python 3
better solution for addobjnotify
reduce the number of libraries created
Prepare for SCons build on Win32 and Win64
SCons build now fully functional again on linux (SCons 2.3.0, Python 2.7)
SCons now uses installed libtiff, if a compatible one is available. Added platform/README to explain config files.
Yet some mingw related changes.
Scons update for mingw.
Experimental SCons update: Debug builds, split libraries, more Windows targets.
Checking in experimental SCons build environment.
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