Tools: moving window statistics, GIF, Base64, ROC AUC, etc.
Contains several basic utility functions including: moving
        (rolling, running) window statistic functions, read/write for
        GIF and ENVI binary files, fast calculation of AUC, LogitBoost
        classifier, base64 encoder/decoder, round-off-error-free sum
        and cumsum, etc.
Orphaned and corrected on 2018-07-20 as check problems
were not corrected despite reminders.