SCons now uses installed libtiff, if a compatible one is available. Added platform/README to explain config files.
Scons update for mingw.
Added rhoptimize to SCons build.
Removed more obsolete stuff, added pcwarp again.
Updated SCons build environment to work with a fresh download and on OS X, as suggested by Randolph Fritz.
Experimental SCons update: Debug builds, split libraries, more Windows targets.
Checking in experimental SCons build environment.
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