Upgrade nutation models to IAU2006 (i.e. IAU2000A R06).#206
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## main #206 +/- ##
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iau2000a()now uses IAU2000A R06 model coefficients (see https://hpiers.obspm.fr/eop-pc/models/nutations/nut.html).iau2000b()is now a truncated version of the above, keeping only terms with amplitude <100 μas, resulting in similar number of terms and precision as the original IAU2000B model.nu2000k()has been rescaled according to Coppola, Seago, & Vallado (2009) to make it more consistent with the IAU2006 (P03) precession model, which was readily implemented by NOVAS and SuperNOVAS.