updated xsl sheets and enketo-core with fixes for readonly inputs
upgraded enketo-core that removes type=file from instance nodes submitted for editing, #260
blindly implemented possible fix for editing records that contain media on browser that do not support the filesystem API, #259
move handle for side slider a little to look better on mobile
Merge pull request #663 from MartijnR/master

fixes for editing records and readonly inputs
Merge pull request #664 from SEL-Columbia/master

fixes for editing records and readonly inputs