TOC: Minimum level to apply anchors

@laurent there’s one item @desk7 is right about. Printing the note adds a # title to the note, before it is rendered for printing. This was probably a quick hack, but must be changed in light of the toc module.

We have to replace it with something that will not influence the toc. I suggest to use html and make the title just 300% bigger than normal text. That should do it.