6CYANA: read cor - CYANA command

Parameters: file=<filename>.cor            (required)
            structure=<integer>            (default: 1)
            chains=<string>                (default: first)
            rigid
            flexible
            bfactor
            append
            newstructure=<integer>         (default: 1)
            append
            new
            unknown=error|warning|skip     (default: error)
