6CYANA: read xplor - CYANA command

Parameters: file=<filename>.xplor          (required)
            segids=<string>                (default: <blank>)
            segoffsets=<string>            (default: <blank>)
            append
            unknown=error|warning|skip     (default: error)

Reads a file with conformational restraints in Xplor format (Bruenger,
1992). A simplified version of the atom selection syntax of Xplor
is used.  Restraints that involve unknown residues or atoms can
either cause an error, a warning, or can be skipped. Optionally,
restraints are appended to those already present.
