Smtlib2

[hernanponcedeleon]

This PR creates a wrapper around the ProverEnvironment which allows to dump the encoding to an smtlib2 file.
Attached are the encodings of ticketlock both with eager and lazy methods, and this is the output of z3

> z3 output/ticketlock-eager.smt2 
unsat
unsat
> z3 output/ticketlock-lazy.smt2 
sat
sat
sat
sat
sat
sat
sat
sat
sat
sat
sat
sat
sat
sat
sat
sat
sat
sat
sat
sat
sat
sat
sat
sat
unsat
unsat

output.zip

[hernanponcedeleon]

I have no clue why the diff from the browser shows changes related to PRs recently merged to development. I double checked that my rebase did not miss some of the changes, e.g., the Location class removed in #725 is not in this branch https://github.com/hernanponcedeleon/Dat3M/tree/smtlib2/dartagnan/src/main/java/com/dat3m/dartagnan/program/memory

I don't get those locally. Attached if the diff I get locally wrt development.

smtlib.patch

[ThomasHaas]

LGTM