See #44 and #57.

* vcsn/core/automatonset.hh, vcsn/algos/inductive.hh: Support tuple.
(complement): We don't know how to complement on a multitape automata,
so disable for the time being.
* tests/python/standard.py: Check it.
* bin/vcsn.in, libexec/vcsn-tafkit.cc (inductive): Bind it.
* tests/bin/test.py (can_check_equivalence): We can't on tuples.