English doc RSTification part 4: The faq_ pages

There was a slight change - the old 'faq' generated from faq.htm
was moved to faq_historical.rst, and faq_sections was renamed to
faq.rst

Reason being, it appears that most of the faq_ pages and possibly
a couple other pages in maindir/ were the result of faq.htm being
broken apart into separate pieces, because there's a ton of
duplicate content in faq.htm.

I'm not really enthused to do all that work all over again, when
the information is mostly contained in other files. So it'll be
left as-is until the end, when I'll either convert it too or
salvage what unique information it does contain for another file.