Updates: Disable maintenance mode once we've finished copying files, to minimize disruption.

props dd32.
fixes #25655.

Built from https://develop.svn.wordpress.org/trunk@25866


git-svn-id: http://core.svn.wordpress.org/trunk@25778 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Always apply the posts_search filter. Restores 3.6 behavior.

props SergeyBiryukov.
fixes #25664.

Built from https://develop.svn.wordpress.org/trunk@25867


git-svn-id: http://core.svn.wordpress.org/trunk@25779 1a063a9b-81f0-0310-95a4-ce76da25c4cd