more documentation for twa_graph internals
* spot/graph/graph.hh, spot/twa/twagraph.hh, spot/twa/twagraph.cc: Implement a dump_storage_as_dot() method. * python/spot/__init__.py (twa_graph.show_storage): New method, above dump_storage_as_dot(). * tests/python/twagraph-internals.ipynb: New file, with documentation about the twa_graph internals, using show_storage() to illustrate everything. * tests/Makefile.am, doc/org/tut.org: Add it. * python/spot/impl.i: Add bindings for out_iterasor, demonstrated in the Python notebook. * spot/twa/twa.hh: Add prop_reset(). Used in the notebook. * NEWS: Mention the new notebook and function. * doc/org/tut50.org: Link to the notebook. * tests/python/ipnbdoctest.py: Adjust for twa_graph_ptr being redefined in the spot namespace.
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