Preselect "All notes" when note manager opens
Fix disappearance of new, saved, unchanged note

If a new note is created but no text is entered, the note is removed
immediately. The way how changes were detected and how new notes were
recognized led to the undesired behavior that new notes with content
(i.e. they have been saved to the DB) have been incorrectly removed if
they had been edited without making changes to the content.
Update homepage URL
Force clean before dist
Push to version 0.8.2