6CYANA: write pdb - CYANA command

Parameters: file=<filename>.pdb            (required)
            bfactor=<real>                 (default: 0.0)
            chains=<string>                (default: *)
            details
            all
            oldall
            connect
            append
            ssf

Writes a coordinate file in PDB (Protein Data Bank; Bernstein et al.,
1977) format. Optionally, the output may be appended to an existing
file.  By default, the Cartesian coordinates of the current structure
are written. Optionally, the Cartesian coordinates of all selected
structures may be written. If the option 'ssf' is chosen ONLY the
file's secondary structure section is written.
