Add paragraphs about two global usergroups
Merge pull request #496 from jrfnl/Global-usergroups

Add paragraphs about two global usergroups
Menu consistency

Nearly all H2's are part of the menu and saved as separate 'post' files, but not all.
This commit/PR fixes the chapters where this was applied inconsistently.
Fix rebase regression
Fix wrongly placed link
Fix rebase regression PR #496