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bookmarks: move the `mirror` option to the `paths` section

A new `bookmarks` section with a `mirror` option have been added. That option
has never been released yet.

This new options is limited since it affect all paths without distinction. In
case where a repository is interacting with multiple peers, being able to
control behavior on a path basis can be quite valuable.

In addition, having more variant of behavior would be interesting, especially a
mode where no bookmark exchanged is tried at all. Such new mode (implemented
later) make a lot of sense for configuration on a path-basis.

Configuration of the default behavior is still possible through the usage of
generic path configuration. The "old" config, becomes:

    [bookmarks]
    mirror=True

becomes:

    [path]
    *:bookmarks.mode=mirror

Differential Revision: https://phab.mercurial-scm.org/D11675

== New Features ==
  * `debugrebuildfncache` now has an option to rebuild only the index files

  * a new `bookmarks.mode` path option have been introduced to control the
    bookmark update strategy during exchange with a peer. See hg help paths for
    details.


== Default Format Change ==

These changes affects newly created repositories (or new clone) done with
Mercurial 6.0.


== New Experimental Features ==

 * Added a new `web.full-garbage-collection-rate` to control performance. See
   de2e04fe4897a554b9ef433167f11ea4feb2e09c for more information

== Bug Fixes ==

 * `hg fix --working-dir` now correctly works when in an uncommitted merge state
 * `rhg` (Rust fast-path for `hg`) now supports the full config list syntax
 * `rhg` now parses some corner-cases for revsets correctly
 * `hg email -o` now works again when not mentioning a revision
 * Lots of Windows fixes
 * Lots of miscellaneous other fixes

== Backwards Compatibility Changes ==


== Internal API Changes ==

The following functions have been removed:

  * `dirstate.normal`
  * `dirstate.normallookup`
  * `dirstate.otherparent`
  * `dirstate.add`
  * `dirstate.remove`
  * `dirstate.drop`
  * `dirstate.__getitem__`

Miscellaneous:

 * `wireprotov1peer`'s `batchable` is now a simple function and not a generator
   anymore