Only rendered well in LaTeX (PDF). Just shown in parenthesis in other formats.
Should be possible, I think, to render in RTF as well, and HTML probably.
Only needed them for PDF output at the moment though.
Instead of just [[section]] you can have [[section][name]] and
depending on format the name will be displayed instead of or
in addition to the section number referred to.
Not sure how useful it is since you can always force one section to have the
max number you want instead.
Anyway also added filling up with dummy sections to make shuffled numbers
on sections in the correct range from 1 to max.
