remove useless function It has no user left and no purpose in live.

add cleanup todo

more doc and cleanup

obsolete: document the cache stuff

obsolete: Improves cache invalidation logic Filecache are not the same that cache property. This can probably be improved

obsolete: some more movement

obsolete: move caches on obsstore No need to clutter local repo

obsolete: remove legacy revset

obsolete: enforce pdiff and pstatus alias in the extension

drop repo.addobsolete We now use createmarkers directly. No black magic with nullid is done anymore.

obsolete: remove usage of addcollapsedobsolete

obsolete: extract high level marker creation in a dedicated util function This prepare the dooms of repo based method.

obsolete: remove debugsuccessors This was kinda duplicate of core "debugobsolete"

obsolete: tag more function for disapearance

obsolete: reorder import