are-equivalent: use realtime
* vcsn/algos/are-equivalent.hh: Here. * doc/notebooks/automaton.is_equivalent.ipynb: Update. * tests/bin/test.py (CHECK_EQUIV): No longer call normalize. (normalize): Use realtime instead of proper(). * tests/python/efsm.py (check): Use normalize: we have a case where we compare lan x lan against lal x lal, and since we don't have synchronize yet, it fails.