FXBHMAKE

       Create basic FITS binary table extension (BINTABLE) header.

       Creates a basic header array with all the required keywords, but with
       none of the table columns defined.  This defines a basic structure
       which can then be added to or modified by other routines.

       FXBHMAKE, HEADER, NROWS  [, EXTNAME  [, COMMENT ]]

       NROWS   = Number of rows in the binary table.

       EXTNAME = If passed, then the EXTNAME record is added with this value.
       COMMENT = Comment to go along with EXTNAME.

       HEADER = String array containing FITS extension header.

       None.

       INITIALIZE = If set, then the header is completely initialized, and any
                    previous entries are lost.
       DATE       = If set, then the DATE keyword is added to the header.
       EXTVER     = Extension version number (integer).
       EXTLEVEL   = Extension level number (integer).
       ERRMSG     = If defined and passed, then any error messages will be
                    returned to the user in this parameter rather than
                    depending on the MESSAGE routine in IDL.  If no errors are
                    encountered, then a null string is returned.  In order to
                    use this feature, ERRMSG must be defined first, e.g.
                       ERRMSG = ''
                       FXBHMAKE, ERRMSG=ERRMSG, ...
                       IF ERRMSG NE '' THEN ...

       GET_DATE, FXADDPAR, FXHCLEAN

       None.

       Warning:  No checking is done of any of the parameters.

       None.

       Data Handling, I/O, FITS, Generic.

       William Thompson, Jan 1992.
       William Thompson, Sep 1992, added EXTVER and EXTLEVEL keywords.

       William Thompson, GSFC, January 1992.

       Version 1, William Thompson, GSFC, 12 April 1993.
               Incorporated into CDS library.
       Version 2, William Thompson, GSFC, 21 June 1994
               Added ERRMSG keyword.
       Version 3, William Thompson, GSFC, 23 June 1994
               Modified so that ERRMSG is not touched if not defined.

       Version 3, 23 June 1994
       Converted to IDL V5.0   W. Landsman   September 1997

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