Mercurial 2.3 sprint, Day 1-2-3

I'm now back from Copenhagen were I attended the mercurial 2.3 sprint with twenty other people. A huge amount of work was done in a very friendly atmosphere.

Regarding mercurial's core:

• Bookmark behaviour was improved to get closer to named branch's behaviour.
• Several performance improvements regarding branches and heads caches. The heads cache refactoring improves rebase performance on huge repository (thanks to Facebook and Atlassian).
• The concept I'm working on, Obsolete markers, was a highly discussed subject and is expected to get partly into the core in the near future. Thanks to my employer Logilab for paying me to work on this topic.

• General code cleanup and lock validation.

Regarding the bundled extension :

• Some fixes where made to progress which is now closer to getting into mercurial's core.
• Histedit and keyring extensions are scheduled to be shipped with mercurial.
• Some old and unmaintained extensions (children, hgtk) are now deprecated.
• The LargeFile extension got some new features (thanks to the folks from Unity3D)
• Rebase will use the --detach flag by default in the next release.

Regarding the project itself:

• We now have a running buildbot for Windows (in addition to the runnable test suite itself).
• We migrated from round-up to bugzilla.

Regarding other extensions:

• hgsubversion got a lot of bug fix (the harmonious image of the Google staff reviewing patches from the Facebook staff).
• Edlund released their repoman tool to manage forests of repositories used in multiple "solutions".
• A new multiundo extension was written (thanks to Edlund and Wolfram Research).

And I'm probably forgetting some stuff. Special thanks to Unity3D for hosting the sprint and providing power, network and food during these 3 days.