context: add a `bumped` method to `changectx` Same as `unstable()`, returns true if the changeset is bumped.

obsolete: add a flag that allows fixing "bumped" changeset The first obsolescence flag is introduced to allows for fixing the "bumped" changeset situation. bumpedfix == 1. Creator of new changesets intended to fix "bumped" situation should not forget to add this flag to the marker. Otherwise the newly created changeset will be bumped too. See inlined documentation for details.

debugobsolete: add --flags option This options allows to specify the `flag` part of obsolete markers. For details about marker flags, check the `mercurial/obsolete.py` documentation. Some random flag are added to a marker to test this feature.

revset: add a bumped revset Select bumped changesets.

obsolete: add the detection of bumped changeset. Bumped changesets are non-public changesets that tries to succeed a public() changeset.

obsolete: have `allsuccessors` takes a list of nodes Additional logic, used to detect mutable history troubles, will need to quickly compute successors of a whole set of changeset.

obsolete: rename `anysuccessors` into `allsuccessors` The "any" prefix looks like it returned a boolean. `allsuccessors` is more accurate.

obsolete: rename `getobscache` into `getrevs` The old name was not very good for two reasons: - caller does not care about "cache", - set of revision returned may not be obsolete at all. The new name was suggested by Kevin Bullock.

largefiles: always create the cache and standin directories when cloning The standin matcher only works if the .hglf directory exists (and it won't exist if 'clone -U' is used, unless --all-largefiles is also specified). Since not even 'update -r null' will get rid of the standin directory, this ensures that the standin directory always exists if the repo has the 'largefiles' requirement. This requirement is only set after a largefile is committed, so these directories will not be created for repos that have the extension enabled but have not committed a largefile. With the standin directory in place, 'lfconvert --to-normal' will now be able to download the required largefiles when converting a repo that was created with 'clone -U', and whose files are not in the usercache. The downloadlfiles command could probably be put inside the 'largefiles' requirement conditional too, but given that the user specified --all-largefiles, there is likely an expectation to print out the number of largefiles downloaded, even if it is 0.

largefiles: fix a traceback in lfconvert if a largefile is missing (issue3519) The largefile may be missing for various reasons, including that a remote repository was cloned without the --all-largefiles option. Therefore, it seems reasonable to attempt to download the missing files and failing that, abort and indicate the affected file and revision so the user can manually fix the problem.