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dirstate: narrow gathering of parent data

The parent data are only going to be useful is the file might be clean. And it
might only be clean if it is tracked in both p1 and the working copy.

Differential Revision: https://phab.mercurial-scm.org/D11584

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


== 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