I'd like us to create some documentation which explains how the dumps work, and how to extend them. This could be in a DEVELOPERS.md file in the root directory. It should include things like:

• Overview of dumps and what different types of dumps are created (public DB, private DB LL-json, HL-json)
• How to add a new table to the dump (increase schema if needed, where to add table definition, update sequences)
• Difference between incremental and full dumps
• When to make a full dump (If schema number has changed, in HL if model definitions have changed)
• How to do an import
• How to make a dump and do an import of a small subset for development purposes