Fix tab button on the write screen in Opera, add tabindex to the menu, don't...

Fix tab button on the write screen in Opera, add tabindex to the menu, don't 'lock' the tab key between the title and the editor. Fixes #8197

git-svn-id: https://core.svn.wordpress.org/trunk@9784 1a063a9b-81f0-0310-95a4-ce76da25c4cd