Avoid full sequential scans on some tables for every query Up to PostgreSQL 11, a CTE is always executed to completion, regardless of whether the result is actually needed for the calling query. A sub-select is not 'fenced' that way. Makes some database requests of GeoServer a lot faster.

The gemma database schema requires PostgreSQL >= 11.

`dot.tmpl` is a template file for `postgresql_autodoc`
to be more similiar to UML and leave out some less useful labels.

See  `../docker/README.md`