Theme compat: Move <head profile> to <link>.

props spmlucas.
fixes #24523.

Built from https://develop.svn.wordpress.org/trunk@27716


git-svn-id: http://core.svn.wordpress.org/trunk@27555 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Ensure the $path is trailing-slashed in domain_exists().

props ejdanderson, ericmann.
fixes #18209.

Built from https://develop.svn.wordpress.org/trunk@27717


git-svn-id: http://core.svn.wordpress.org/trunk@27556 1a063a9b-81f0-0310-95a4-ce76da25c4cd