* tests/python/ipnbdoctest.py: Adjust to Python <3.6. * tests/python/_autparserr.ipynb: Adjust to older IPython version. * tests/python/stutter-inv.ipynb: Avoid pandas because its output varies from version to version.
* tests/python/_autparserr.ipynb: New files, containing error checking code from automata-io.ipynb and piperead.ipynb. * tests/python/automata-io.ipynb: Remove error checks, and pipe examples from piperead.ipynb. * tests/python/piperead.ipynb: Delete. * tests/python/word.ipynb: Move error checking code... * tests/python/_word.ipynb: ... in this new file. * doc/org/tut.org, tests/Makefile.am: Adjust.
