Minor fixes:
- Fixed data.sort function in manage_new_data()
- Reply count for main annotation restored
Standalone page fix when the annotation itself is deleted
- Separate delete handling for the root annotation
- After delete if shows a "This annotation has been deleted!" sign for this annotation.
- Redaction flow is unaffected
Fix typo: = instead of is
Merge pull request #545 from hypothesis/544-delete-breaks-displayer

Fixes #544