obsolete: simplify module docstring

obsolete: simplify rebase wrapping code and change relation creation We have don't have changeset simply pruned by rebase. When they disapeared, that means that destination is a valid successors for them.

obsolete: more comment

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