I feel like tags in note content are just links to the tag page, and
shouldn't mark the page with that tag.
Also the way it was done - adding content tags to frontmatter -
interferes with my WIP page properties component, I want to only show
"explicitly put in the frontmatter" tags.
Added an option to have those "outgoing" tags that don't tag the page,
yet get a tag page generated (so that the popover is not 404 if there
are no pages with this tag).
1038d1bac7