obsmarker: track operation by default We added support for including the operation responsible for creating the obsmarker in 3546a771e376 (obsolete: add operation metadata to rebase/amend/histedit obsmarkers, 2017-05-09). However, soon thereafter, in f432897a9f49 (obsmarker: add an experimental flag controlling "operation" recording, 2017-05-20), it was hidden behind a config that was off by default. It seems unlikely that people will manually turn it on, and obsmarkers/evolution as a whole is still experimental anyway, so let's turn on the tracking by default. Differential Revision: https://phab.mercurial-scm.org/D722

uncommit: add an experimental.uncommitondirtywdir config There are people who wants to do `hg uncommit` on dirty working directory, so this patch adds a config which can be used to the achieve that. Adds tests for the same. Differential Revision: https://phab.mercurial-scm.org/D735

uncommit: don't allow bare uncommit on dirty working directory As per IRC discussion and suggestion by Augie, we should not allow bare `hg uncommit` on dirty working directory. Differential Revision: https://phab.mercurial-scm.org/D734

uncommit: rename the flag 'empty' to 'keep' which retains empty changeset This patch renames the flag 'empty' which retains the empty changeset if all the files are uncommitted to 'keep'. Differential Revision: https://phab.mercurial-scm.org/D726