CHANGES IN 'artfima' VERSION 1.1 (2015-11-7)
    o    can hold d parameter fixed in ARTFIMA model
CHANGES IN 'artfima' VERSION 1.2 (2015-01-21)
    o    "Whittle" is default estimation algorithm
    o    se's for estimates computed with Whittle method
    o    new functions: informationMatrixARTFIMA(), seARTFIMA()
    o    added dataset SB32
    o    bugs fixed with sdfarfima()
    o    can choose optimization to be used with optim() method
    o    documentation fix for sdfartfima()
    o    simulation investigation report included
CHANGES IN 'artfima' VERSION 1.3 (2016-05-13)
    o    many code improvements to artfima()
    o    retitled and improved function artfimaSDF()
    o    plot() method added for class "artfima", plot.artfima()
    o    bestModels() exhaustive enumerative search best AIC/BIC model within
            the entire range of models (ARTFIMA, ARFIMA, ARIMA)
    o    tseg() simulates interesting example time series
    o    Periodogram() scaling factors as in artfimaSDF()
CHANGES IN 'artfima' VERSION 1.4 (2016-05-15)
    o    minor bug fixes
    o    optional arguments added to plot.artfima()
    o    seriesa, ogden
    o    functionality improvements to bestModels()
CHANGES IN 'artfima' VERSION 1.5 (2016-06-28)
    o    minor bug fixes
    o    predict.artfima
    o    bev, nilemin