No more magic for deciding which comment is important or not.

While looking at an issue you no longer need to go back to the issue list for creating the next one.

Most comments are not so essential for the whole team and plenty are private notes. It's recommended to disable those and enable by hand when a comment is important.

Fix for Postgresql Migration 3.1 --> 4.0

Fixes #2349

GitLab is not yet downloaded at this point in the installation guide.

Fixes #2334