DBHELP

     List available databases or items in the currently open database

     Procedure to either list available databases (if no database is
     currently open) or the items in the currently open database.

     dbhelp, [ flag , TEXTOUT=, /SORT ]

     flag - (optional) if set to nonzero then item or database
             descriptions are also printed
             default=0
             If flag is a string, then it is interpreted as the
             name of a data base (if no data base is opened) or a name
             of an item in the opened data base.   In this case, help
             is displayed only for the particular item or database

      None

      TEXTOUT  - Used to determine output device.  If not present, the
                value of !TEXTOUT system variable is used (see TEXTOPEN )
               textout=0       Nowhere
               textout=1       if a TTY then TERMINAL using /more option
                                   otherwise standard (Unit=-1) output
               textout=2       if a TTY then TERMINAL without /more option
                                   otherwise standard (Unit=-1) output
               textout=3       .prt
               textout=4       laser.tmp
               textout=5      user must open file
               textout=7      same as 3 but text is appended to .prt
                               file if it already exists.
               textout = filename (default extension of .prt)
        /SORT - If set and non-zero, then the help items will be displayed
               sorted alphabetically.    If more than one database is open,
               then this keyword does nothing.

       If no data base is opened then a list of data bases are
       printed, otherwise the items in the open data base are printed.
       If a string is supplied for flag and a data base is opened
       flag is assumed to be an item name.  The information for that
       item is printed along with contents in a optional file
       zdbase:dbname_itemname.hlp
       if a string is supplied for flag and no data base is opened,
       then string is assumed to be the name of a data base file.
       only information for that file is printed along with an
       optional file zdbase:dbname.hlp.

       DB_INFO(),DB_ITEM_INFO(),FIND_WITH_DEF(), TEXTOPEN, TEXTCLOSE, UNIQ()

       V5.3 or later (uses vectorized FDECOMP)

       Version 2  D. Lindler  Nov 1987 (new db format)
       Faster printing of title desc. W. Landsman  May 1989
       Keyword textout added, J. Isensee, July, 1990
       Modified to work on Unix, D. Neill, ACC, Feb 1991.
       William Thompson, GSFC/CDS (ARC), 1 June 1994
               Added support for external (IEEE) representation.
       William Thompson, GSFC, 3 November 1994
               Modified to allow ZDBASE to be a path string.
       Remove duplicate database names  Wayne Landsman    December 1994
       8/17/95 jkf/acc - force lowercase filenames for .hlp files.
       Converted to IDL V5.0   W. Landsman   September 1997
       Added /SORT keyword  J. Sandoval/W. Landsman     October 1998
       V5.3 version use vectorized FDECOMP   W. Landsman   February 2001
       Recognize 64 bit, unsigned integer datatypes W. Landsman September 2001
       Fix display of number of bytes with /SORT W. Landsman February 2002
       Assume since V5.2                 W. Landsman February 2002

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