py3: back out 23323092f0a7
D6623 has now been accepted in Mercurial (commit 83666f011679), so
evolve commit 23323092f0a7 (py3: convert _origdoc to sysstr to match
__doc__, 2019-07-09) is not longer needed.
syntax: re
/figures/[^/]+\.png$
^html/
\.pyc$
~$
\.swp$
\.orig$
\.rej$
^tests/.*\.err$
^tests/easy_run.sh$
^build/
^dist/
^MANIFEST$
^docs/tutorials/.*\.rst$
\.ico$
tests/\.testtimes
^docs/training/graphs/
^docs/training/html/
^docs/training/index.html
^docs/training/graphviz-images/
^docs/training/img/
^docs/training/output/
^docs/training/pandocfilters/