convert h2 database to latest

[jflamy]

We are currently on the last database H2 version of the previous generation.
The current format is not compatible, needs an export/import for update.
We could force an export in JSON format and re-import.

But to do this transparently it is probably easier to update the database itself to the new format.

Update owlcms to new drivers. Reading old database will fail. Then run the following java jar on the database, and retry.
https://manticore-projects.com/H2MigrationTool/index.html

[jflamy]

Could now be done using the control panel.