Merge pull request #5132 from RosettaCommons/roccomoretti/rs_single_quote
Enable RosettaScript parsing to allow single quotes on options
According to @mwfranklin on Slack, the XML validator is perfectly fine with `<ScoreFunction name='sf' weights='scorefxn.wts'/>`, but the Rosetta-specific Tag parser chokes on it, with a particularly obtuse error message.
Supporting single quotes is relatively straightforward.