- Remove all genindex.rst files, these are generated and should not
exist in our source.
- Fix the HTML templates so the local specialisation works.
- Add a index link to the sidebar for HTML.
Note, there is no TOC entry for the index in the PDF output and I
cannot figure out how to add one.
Closes#3503
This change combined with the element list change in latex generates
a much better looking PDF.
Add a page break before each directive to like th previous versions of the
manuals.
