Upgrade: When upgrading from WordPress 3.5, if an empty twentytwelve theme directory exists, remove it to allow the installation of Twenty Twelve. See #22856. For trunk


git-svn-id: http://core.svn.wordpress.org/trunk@23253 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Clarify the Documentation in win_is_writable() and move an inline comment to the Docblock, reduces confusion about what the function actually does. See #22900


git-svn-id: http://core.svn.wordpress.org/trunk@23254 1a063a9b-81f0-0310-95a4-ce76da25c4cd