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copies-rust: rename TimeStampedPathCopies to InternalPathCopies

We are looking into moving away from TimeStampedPathCopy (that use is_ancestors
call to detect overwrite) in favor of an approach that does not requires
is_ancestors calls. Yet we will still need an internal representation that
differs from the returned result.

So we call it "InternalPathCopies" which is generic but clear.

Differential Revision: https://phab.mercurial-scm.org/D9641

== New Features ==
 
 * `hg purge` is now a core command using `--confirm` by default.
 
 * The `rev-branch-cache` is now updated incrementally whenever changesets
   are added.


== New Experimental Features ==

 * There's a new `diff.merge` config option to show the changes
    relative to an automerge for merge changesets. This makes it
    easier to detect and review manual changes performed in merge
    changesets. It is supported by `hg diff --change`, `hg log -p`
    `hg incoming -p`, and `hg outgoing -p` so far.


== Bug Fixes ==



== Backwards Compatibility Changes ==


== Internal API Changes ==

 * `changelog.branchinfo` is deprecated and will be removed after 5.8.
   It is superseded by `changelogrevision.branchinfo`.