Move warning limiter to common package to flesh up the misc package. The remaining stuff in misc has dependencies to the config and cannot be removed from there easily w/o introducing cyclic imports. I have to rethink this.

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`