CHANGES IN 'artfima' VERSION 1.1 (2015-11-7)
    o    can hold d parameter fixed in ARTFIMA model
CHANGES IN 'artfima' VERSION 1.2 (2012-01-21)
    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