Properly track dependencies of SWIG files to trigger recompilation when
appropriate.
Closes issue #250.
* python/Makefile.am: Track the dependencies of .i files à la automake.
* python/Makefile.am: Use nobase_ for installing python files. This
required removing the $(srcdir) prefix used almost everywhere in this
file, which in turn enabled the use of subdir-objects to remove
an Automake warning. The downside is that the Makefile probably won't
support VPATH builds with some inferior implementations of Make.
* python/spot/ltsmin.i: New file.
* python/Makefile.am: Add it.
* python/spot/impl.i: Add bindings for kripke and fair_kripke.
* tests/python/ltsmin.ipynb: New file.
* tests/Makefile.am, doc/org/tut.org: Add it.
* tests/python/ipnbdoctest.py: Make it possible for notebook
to exit(77).
* debian/control: Make the Python package dependent
on libspotltsmin0.
* python/spot/__init__.py: Typo.
