= Version Control Refactoring =

This branch is a sandbox for introducing new features
that are potentially disruptive.

This is based on the previous refactoring and on the
TracDiff branch, both of them pretty much stable
and already integrated in the trunk for milestone:0.10.

The forthcoming changes aim to be better support some
advanced version control system backends, like 
[http://www.selenic.com/mercurial Mercurial].
To that effect, the changes added to the core will be 
exercised by jointly developing the TracMercurial plugin.

See also the related 
[http://thread.gmane.org/gmane.comp.version-control.subversion.trac.devel/161 thread]
on the Trac Devel mailing list.

== Support for Multiple scopes within a Repository ==

This basically means fixing #1830.


== Support for Mercurial-like Version Control System ==

===  Basic Level ===
 * support for non-numerical changesets (start with hexadecimal digit support)
 * support for extra changeset properties

Those are the minimal changes needed so that the Mercurial plugin can work at all.


=== Advanced Level === 

 * Support for direct jump to a tag or a branch
 * Support for arbitrary changeset names (e.g. `[tip]` or `[head]`)

=== Support for Big Repositories ===

This means extended cache support, and certainly needs some big changes
to the way caching is done.