python: upgrade notebook format to v4
Fixes #311. * tests/python/ipnbdoctest.py: Adjust to process the new format, with a lot of inspiration from Vcsn's copy of this file. * tests/python/_altscc.ipynb, tests/python/_aux.ipynb, tests/python/acc_cond.ipynb, tests/python/accparse.ipynb, tests/python/alternation.ipynb, tests/python/atva16-fig2a.ipynb, tests/python/atva16-fig2b.ipynb, tests/python/automata-io.ipynb, tests/python/automata.ipynb, tests/python/decompose.ipynb, tests/python/formulas.ipynb, tests/python/gen.ipynb, tests/python/highlighting.ipynb, tests/python/ltsmin-dve.ipynb, tests/python/ltsmin-pml.ipynb, tests/python/parity.ipynb, tests/python/piperead.ipynb, tests/python/product.ipynb, tests/python/randaut.ipynb, tests/python/randltl.ipynb, tests/python/stutter-inv.ipynb, tests/python/testingaut.ipynb, tests/python/word.ipynb: Upgrade to the new format. * NEWS: Mention the change.
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