next: bail out early in `hg next --evolve` if dirty wdir
This patch adds logic to bail out early when --evolve is passed with next
command and the working directory is dirty.
This will help us in preventing the message saying `do you want --merge` which
is useless and misleading when `--evolve` is passed.
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/