Fixes #25

We just add the current id to the URL and this problem is solved. I
don't know what is exactly meant by the other situation, but as the only
moment the (un)folding code triggers is on load, and back buttons don't
reload I guess it won't work.
Improved folding behaviour of comments (and input)

Both sections have >>> / <<<
Removed log.log
Fixes #19

Now the search results indicate which section and enclosing tag (if
applicable) they belong to. And I fixed the silly way I added the
preview link.

One (minor) problem, if the name of the section is *really* long the
layout can be borked. But that would happen with the previous version
too. So I should find a way to place something at the right of the last
line of a paragraph.