Correct Vagrant hostname.
Make style more consistent.
Return trendstore from function 'create_staging_table'.
Add unique constraint on attributestore to prevent name collisions.
Add minerva.trigger_mark_modified setting to the PostgreSQL configuration of the Vagrant box.
Add convenience function for creating attribute stores.
Prevent escaping of for NULL values (\N)
Explicitly set NULL string
Merge branch 'develop' into release/4.6