Changeset 17802 for trunk/wp-content/themes/twentyeleven/sidebar-page.php

Twenty Eleven updates and fixes, see #17198

• Add explanatory comments in all templates, following Twenty Ten's example
• Stick with twentyeleven_ for prefixing filter names
• Use post format content templates in search results
• First pass at adding a template for adding a sidebar to pages
• Add a featured post header to standard sticky posts
• Style fixes: print media, comment styles for pages with sidebars, color of meta links on image post format