Twenty Thirteen: remove `hgroup` from the theme markup structure since it's been dropped from HTML5 spec. Props obenland for the starter patch. Fixes #24114.

git-svn-id: http://core.svn.wordpress.org/trunk@24072 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Thirteen: fix case where title in author bio was indented when avatars were disabled in Discussion settings. Props obenland, fixes #24167.

git-svn-id: http://core.svn.wordpress.org/trunk@24073 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Thirteen: avoid setting absolute positioning and a magic height number for child comments. This allows for a more flexible layout. Props obenland, fixes #24172.

git-svn-id: http://core.svn.wordpress.org/trunk@24074 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Respect $compat values for the link format fallback output. props wonderboymusic. see #23347.


git-svn-id: http://core.svn.wordpress.org/trunk@24075 1a063a9b-81f0-0310-95a4-ce76da25c4cd