Fix conditional rendering of file/URL import form elements Once import via file was chosen for an import type, the file upload field appeared also for import types that do not support file upload. Indentation will be fixed in another commit to keep the diff readable here.

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`