Remove deprecated Markdown text fields in Blog and Article.
Amendments in the add/edit Article form.
Amendments in the add/edit Post form.
Enable tooltips in the edit forms.
Add title in the add/edit Song form.
Remove one leftover Markdown field.
Revise field order and editability in Post.
Update templates after Post dropped Markdown.
Revise field order and editability in Article.
Revise field order and editability in Event.
Revise field order and editability in Song.
Remove deprecated Song.key.
Minor.
Set missing unique attribute on some slug fields.
Amend help_texts in Song.
Bigger textarea for lyrics in add/edit Song.
Amendments in add/edit Song.
Minor.
Add instructions for the Song lyrics format.