tests: demonstrate prune --pair not moving bookmark correctly
After `mkcommit n2` line the bookmark is on the correct changeset, but when we
prune --pair the two newly created changesets (revs 13 and 14), the bookmark
gets moved to their ancestor (rev 0). Instead, it should've moved to the last
of their successors (rev 12).
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/