Redesign Note Edit History box
Replace "Recent Notes" with "Seen by" box
Bugfix: [Notes] "Seen by" counter not working properly
Bugfix: Cannot download attached files with Unicode characters in filenames

Use Unidecode to transliterate Unicode filename into the closest possible
representation in ASCII
Bugfix: Attachments are 0KB size sometimes
Bugfix: posts/comments search not working on non-primary networks
Bugfix: Comments on note not showing up
Update models.py to work with multiple databases