Remove direct call to add_new_user_to_blog() as this is already hooked into wpmu_activate_user.

The second argument passed by that hook is not $email, so let's change that. It is not used.

props wonderboymusic.
fixes #15173.
Imporove a selector targeting taxonomy meta boxes. props SergeyBiryukov. see #22975.

Uses correct patch, reverting [23517].
Allow paths with two consecutive dots to be passed to home_url() and all related *_url() functions.

props markjaquith.
fixes #19032.
Twenty Thirteen: remove unused selector.
Twenty Thirteen: make footer widget area the primary sidebar, acting as "secondary" content. Move optional sidebar widget area to "tertiary" content. Props obenland, fixes #23644.