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dirstate-v2: Move fixed-size tree metadata into the docket file

Before this changeset, the dirstate-v2 data file contained not only nodes
and paths that may be reused when appending to an existing file,
but also some fixed-size metadata that applies to the entire tree
and was added at the end of the data file for every append.

This moves that metadata into the docket file, so that repeated "append"
operations without meaningful changes don’t actually need to grow any file.

Differential Revision: https://phab.mercurial-scm.org/D11098

== New Features ==

 * `hg config` now has a `--source` option to show where each
   configuration value comes from.


== Default Format Change ==

These changes affects newly created repositories (or new clone) done with
Mercurial 5.8.


== New Experimental Features ==


== Bug Fixes ==


== Backwards Compatibility Changes ==


== Internal API Changes ==