added: comment-status XPath function support, by replacing XPath evaluator with custom OC fork
added: comment-status XPath function support,
by replacing XPath evaluator with custom OC fork

closes https://github.com/kobotoolbox/enketo-express/issues/593

OpenClinica/enketo-express-oc,OpenClinica/enketo-express-oc,OpenClinica/enketo-express-oc