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dirstate: Remove the `state == ' '` special case

Previously this was used to create a `DirstateItem` representing dirstate tree
nodes that semantically don’t have an associated `DirtateItem`.
This isn’t used anymore now that `dirstatemap.debug_iter` yields plain tuples.

Differential Revision: https://phab.mercurial-scm.org/D11464

== 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
 * 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