Add umask option.
Overwrite permissions every time.
Fixes #2312
Send sharing notifications.
Fixes #2295
Include instance in queue messages.
Different queue message types use different keys.
Report object changes to the queue.
Refs #1792
Fixes for non-automatic container versioning policy.
Refs #2030
Open files in backend as read-only if such is the filesystem.
Check Content-Type up to semicolon.
Fixes #2240
close sqlalchemy connections literally
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