Use format parameter for Conflict (409) replies.
Fixes #1934
Add ignore_content_type parameter on COPY/MOVE.
Fixes #1860
Document sharing headers.
Fixes #1832
Use /login to redirect or not, depending on the configuration. Document.
Fixes #1778
Update admin guide.
Change sync command.
Remove custom doc theme.
Remove im app.
Refs #1761
Document ETag changes.
Refs #1792
Add backend object retrieve by UUID. Expose UUID at the frontend. Document.
Refs #1790
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