3.1.0

[k1o0]

• ONE cache generation handles tags with only aggregate datasets
• dropped session_path cache table column
• improved cache table data types
• collection and hash fields now non-nullable
• collection and revision fields serialized as empty str when blank/null
• improved user documentation
• nullable session field in Task serializer
• tasks management command to remove old tasks
• lab name now ALF validated
• do not cascade delete insertions when chronic insertion deleted
• projects admin page sorted by name