Revisions UI: Fix table colgroup (Say what?) for post titles when they haven't been changed. see #24425.

git-svn-id: http://core.svn.wordpress.org/trunk@24529 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Make wp_mail() return the actual result of PHPMailer::Send() instead of always returning true. props chmac. fixes #23642.

git-svn-id: http://core.svn.wordpress.org/trunk@24530 1a063a9b-81f0-0310-95a4-ce76da25c4cd