metomi/rose#580: fix file page bug
metomi/rose#580: fix file page bug.

This fixes the handling of unexpected variables in file sections.
Merge pull request #1081 from benfitzpatrick/580.rose-edit-bad-file-content

#580: rose edit: fix file page unexpected content
Update CHANGES.md
Fix instability in test battery
Merge pull request #1083 from matthewrmshin/fix-unstable-tests

Fix instability in test battery