Merge pull request #2253 from RosettaCommons/Cyrus/mergetarget
From Indigo King at Cyrus:
RandomResidueSelector: option to select random residue clusters
RandomResidueSelector currently has an option to select >1 residue at a time. This PR adds new option to ensure that, when multiple residues are selected, they are all close to each other (within N angstroms, where N is also an option)