Updating to SCons 3.x, adding support for Python 3
Build with VC2013 until text pipe bug is fixed; prepare for pyinstaller on scripts
more flexible gl/glu checks for all platforms
Tifflib support and sleeker binaries on Windows
SCons build system learns about platform architecture
Changes for MINGW compilation using SCons (thanks to C. Kohler)
SCons now checks for installed auxiliary support files.
SCons now uses installed libtiff, if a compatible one is available. Added platform/README to explain config files.
SCons build simplifications.
Updated SCons build environment to work with a fresh download and on OS X, as suggested by Randolph Fritz.
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