FXBTFORM

       Returns information about FITS binary table columns.

       Procedure to return information about the format of the various columns
       in a FITS binary table.

       FXBTFORM,HEADER,TBCOL,IDLTYPE,FORMAT,NUMVAL,MAXVAL

       HEADER  = Fits binary table header.

       None.

       TBCOL   = Array of starting column positions in bytes.
       IDLTYPE = IDL data types of columns.
       FORMAT  = Character code defining the data types of the columns.
       NUMVAL  = Number of elements of the data arrays in the columns.
       MAXVAL  = Maximum number of elements for columns containing variable
                 length arrays, or zero otherwise.

       None.

       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 = ''
                       FXBTFORM, ERRMSG=ERRMSG, ...
                       IF ERRMSG NE '' THEN ...

       FXPAR

       None.

       None.

       None.

       Data Handling, I/O, FITS, Generic.

       W. Thompson, Feb. 1992, from TBINFO by D. Lindler.
       W. Thompson, Jan. 1993, renamed to be compatible with DOS limitations.

       William Thompson, GSFC, February 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 4, William Thompson, GSFC, 9 April 1997
               Modified so that variable length arrays can be read, even if
               the maximum array size is not in the header.
       Version 5  Wayne Landsman, GSFC, August 1997
               Recognize double complex array type if since IDL version 4.0

       Version 6
       Optimized FXPAR call, CM 1999 Nov 18

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