Fix il/li tag

for simple integration of the result into existing page.

Hopefully this solves the problem of unreliable answers from some
provers like Vampire: there is no such answer "unknown" just 0.01
seconds before the time limit anymore

after the first one.

The smoke detector try to detect when a goal is proved
because the context is self contradicting.

The way it is configured in session is not very pretty.

  long lines

trailing whitespaces and long lines