Updates: Saner stats and rollback handling. WP.org now collects basic stats on non-auto updates as they have been hugely informative.

props dd32 for initial patch.
fixes #25657.

Built from https://develop.svn.wordpress.org/trunk@25863


git-svn-id: http://core.svn.wordpress.org/trunk@25775 1a063a9b-81f0-0310-95a4-ce76da25c4cd