rebase: update the rebase wrapping to works with hg 4.6
Mercurial core commit bd0086bd3af4 removed _makeextrafn hence breaking our
wrapping. Update the code to wrap rebaseruntime directly in a way that's
compatible with hg 4.1+.
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/