Moved DOM query "#table th" outside of the loop.
Reviewed comment that clearly must have been from the early days.
Added special filter 'redo:filter'.

It stops inspecting filters at the specified one.
Added document tag 'skip_me' to skip documents (once).
This makes use of _view/types-year, supposedly.

Granted it needs a little tweaking in the folloging way: I re-stacked the last
filter and tell filter_documents to run it by _list/tabulate again. This is
because I end up with wrong document times otherwise. Pre-filtering mere types,
however, works precise and doesn't require any post-filtering.
On the bright side, I experienced improvements in response time already, so
this seems like the way to go.
Deleted skip_me tag unconditionally.

The other version looked stupid.
This avoids reprocessing the prefilter if only types are involved.

I've tested it and I need to test it even more because right now I am
absolutely not sure if this works the right way.