also, remove all customization from the Z3 3.x section in prover detection.
I find it morally wrong to chase magic options of a closed-source program.
We should add an option for a prover only when we have clear understanding
of what it does and good reasons to believe that it is useful in our case.

- add the provers list which can be found in the session.
- remove Detected/Undetected since we use only the information
provided by the session, not which provers are currently available
on the current computer.

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