6CYANA: read lol - CYANA command

Parameters: file=<filename>.lol            (required)
            append
            unknown=error|warning|skip     (default: error)

Reads a lower limit distance restraints file. Restraints that involve
unknown residues or atoms can either cause an error, a warning, or
can be skipped. Optionally, the distance restraints are appended to
those already present.
