Autoupgrade database on upgrade

[Kris Deugau]

Some changes will require database schema changes, or changes in the default alloctypes.

Create

• a table to track misc metadata (IPDB code version, etc) so we know which upgrade path(s) we have to take
• a set of n.mm -> o.pp version upgrade scripts - probably simplest to just to n -> m -> p if the known versions are n, m, and p, and we're suddenly running p on a database claiming it's from n