FXBSTATE()

       Returns the state of a FITS binary table.
 Explanation : This procedure returns the state of a FITS binary table that
               was either opened for read with the command FXBOPEN, or for
               write with the command FXBCREATE.
 Use         : Result = FXBSTATE(UNIT)
 Inputs      : UNIT    = Logical unit number returned by FXBOPEN routine.
                         Must be a scalar integer.
 Opt. Inputs : None.
 Outputs     : The result of the function is the state of the FITS binary
               table that UNIT points to.  This can be one of three values:
                       0 = Closed
                       1 = Open for read
                       2 = Open for write
 Opt. Outputs: None.
 Keywords    : None.
 Calls       : FXBFINDLUN
 Common      : Uses common block FXBINTABLE--see "fxbintable.pro" for more
               information.
 Restrictions: None.
 Side effects: If UNIT is an undefined variable, then 0 (closed) is returned.
 Category    : Data Handling, I/O, FITS, Generic.
 Prev. Hist. : None.
 Written     : William Thompson, GSFC, 1 July 1993.
 Modified    : Version 1, William Thompson, GSFC, 1 July 1993.
 Version     : Version 1, 1 July 1993.
       Converted to IDL V5.0   W. Landsman   September 1997

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