Do not use form style for modal dialog inputs, https://github.com/MartijnR/enketo-grid-theme/issues/50
upgraded enketo-core with less aggressive native-XPath-evaluator usage to keep supporting automatic date conversion of strings
Merge pull request #677 from MartijnR/master

fix for XPath date-string comparisons
Merge pull request #678 from SEL-Columbia/master

fix for XPath date-string comparisons