Ampleforth needs WYSIWYG font selection, font size, heading/section type

[gbracha]

This is slightly more complex than #105, because we need a menu of options to choose from.

For sections/headings, we could use support for both unnumbered (as in Googledocs) and numbered (as in LaTeX) sections.
Choosing Hn or sub...section, with a * at the end to indicate no numbering would be ok.

[gbracha]

We have h1 & H2. We really need the sections menu to activate all H1 - H6, and numbered sections as well. This turns out to be a tad messy, because the menu perturbs the document.