ASTROLIB

       Add the non-standard system variables used by the IDL Astronomy Library

       Also defines the environment variable or VMS
       logical ASTRO_DATA pointing to the directory containing data files
       associated with the IDL Astronomy library (system dependent).

       ASTROLIB

       None.

       None.

       The non-standard system variables !PRIV, !DEBUG, !TEXTUNIT, and
       !TEXTOUT are added using DEFSYSV.

       Written, Wayne Landsman, July 1986.
       Use DEFSYSV instead of ADDSYSVAR           December 1990
       Converted to IDL V5.0   W. Landsman   September 1997
       Test for system variable existence before definition    July 2001

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