- Update to version 1.27
  * The printed appearance of both vectors and of vector 
    functions like Earth locations and Earth satellites 
    have been rewritten to be more informative and 
    consistent.
  * Added compute_calendar_date() which lets the caller 
    choose the Julian calendar for ancient dates instead of 
    always using the proleptic Gregorian calendar. This 
    should be particularly useful for historians.
  * Added J() that builds a time array from an array of 
    floating point years. #436
  * Added four new strftime methods for the non-UTC 
    timescales (#443). All four of them support %f for 
    microseconds, and provide a reasonable default format 
    string for callers who don’t wish to concoct their own:
      tai_strftime()
      tt_strftime()
      tdb_strftime()
      ut1_strftime() 
  * Thanks to several fixes, comets and asteroids with 
    parabolic and hyperbolic orbits should now raise fewer 
    errors.
 *  The prototype planetary_magnitude() can now return 
    magnitudes for Uranus without raising an exception. The 
    routine does not yet take into account whether the 
    observer is facing the equator or poles of Uranus, so 
    the magnitude predicted for the planet will only be 
    accurate to within about 0.1 magnitudes.

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