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      Returns the dimensions for a column in a FITS binary table.
  Explanation : This procedure returns the dimensions associated with a column
              in a binary table opened for read with the command FXBOPEN.
  Use : Result = FXBDIMEN(UNIT,COL)
  Inputs : UNIT = Logical unit number returned by FXBOPEN routine.
                        Must be a scalar integer.
              COL = Column in the binary table to read data from, either
                        as a character string containing a column label
                        (TTYPE), or as a numerical column index starting from
                        column one.
  Opt. Inputs : None.
  Outputs : The result of the function is an array containing the
              dimensions for the specified column in the FITS binary table
              that UNIT points to.
  Opt. Outputs: None.
  Keywords : 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 = ''
                              Result = FXBDIMEN( ERRMSG=ERRMSG, ... )
                              IF ERRMSG NE '' THEN ...
  Common : Uses common block FXBINTABLE--see "fxbintable.pro" for more
  Restrictions: None.
  Side effects: The dimensions will be returned whether or not the table is
              still open or not.
              If UNIT does not point to a binary table, then 0 is returned.
              If UNIT is an undefined variable, then 0 is returned.
  Category : Data Handling, I/O, FITS, Generic.
  Prev. Hist. : None.
  Written : William Thompson, GSFC, 4 March 1994.
  Modified : Version 1, William Thompson, GSFC, 4 March 1994.
              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 : Version 3, 23 June 1994
      Converted to IDL V5.0 W. Landsman September 1997

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