Database migration approach

[pfalcon]

This tickets tries to capture experience implementing new YAML-based "database" format, #3. Part of that would be migrating older format to new. But I personally don't run any "production" RE project yet, and everyone knows that open-source projects are there to scratch own's itch. Nor I have knowledge about other people using it in "production" mode (like, running long, multi-session RE projects, vs just loading up a binary and looking at a particular thing, essentially in once-off manner). With that in mind, working on migration code isn't really an exciting or fulfilling part of ScrachABit hacking, at least so far.

So, this ticket is to solicit - do you use ScrachABit in "production" mode? If so, let's discuss how to handle database migrations.