Fixes to MINGW build
Changes for MINGW compilation using SCons (thanks to C. Kohler)
SCons now checks for installed auxiliary support files.
Invoke test suite from SCons and installation instructions.
SCons now uses installed libtiff, if a compatible one is available. Added platform/README to explain config files.
Set default to ray/, so all executables end up in ray/bin/.
Removed obsolete files and programs from SCons build.
SCons build simplifications.
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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