Set RTL body class for iframes.

Props mitchoyoshitaka
see #24149


git-svn-id: https://core.svn.wordpress.org/trunk@24994 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Silence is_dir() to avoud warning when upload_tmp_dir is outside open_basedir.

Props dpash
fixes #24704


git-svn-id: https://core.svn.wordpress.org/trunk@24995 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Return true from wp_redirect() when redirect successful. Update phpdoc.

Props tivnet
fixes #24969


git-svn-id: https://core.svn.wordpress.org/trunk@24996 1a063a9b-81f0-0310-95a4-ce76da25c4cd