v3.1

This was the “database optimization” release, which included major, major performance improvements leveraged from the 3.0 architecture, plus many other data-centric features, like real data typing in the database, and derived values being stored in the database just like regular data.

Two maintenance releases, 3.11 and 3.12 were made within six months, to add some newly developed improvements and fixes from the 4.0 development branch.