Howto upgrade to current postgres version

[ngiger]

Updating to the actual Postgres 17 version is more than just using pgupgrade.
pgupgrade is not problem for yus and migel, but oddb.org still has a lot of references to oid, which is no longer supported under postgres 12 and later, see releas notes 12.
We must answer the following questions:

• do we have to rename oid to another name?
• can we replace oid by odba_id?
• how can we migrate (maybe even dumping the whole to yaml and reloading in empty database). This could eliminate cruft we have in the database