[ticket/11957] Viewport meta

PHPBB3-11957
[ticket/11957] Viewport meta for install_update_diff

PHPBB3-11957
[ticket/11957] Replace corner images with CSS3 corners

PHPBB3-11957
[ticket/11957] Remove menu toggle

PHPBB3-11957
[ticket/11957] Responsive layout and menu

PHPBB3-11957
[ticket/11957] Include admin.js in footer

Include admin.js in footer, swap .hasjs and .nojs

PHPBB3-11957
[ticket/11957] Enhance responsive nav with JS

PHPBB3-11957
[ticket/11957] Adjustments to ACP layout, menu and some elements

PHPBB3-11957
[ticket/11957] Use fixed width for sidebar

Use fixed width for sidebar and few minor fixes for other items

PHPBB3-11957
[ticket/11957] Responsive ACP tables

PHPBB3-11957
[ticket/11957] Remove IE6 hacks

PHPBB3-11957
[ticket/11957] Responsive jQuery popups

PHPBB3-11957
[ticket/11957] Responsive forms

PHPBB3-11957
[ticket/11957] Change avatars gallery from table to list

PHPBB3-11957
[ticket/11957] Responsive forums list

PHPBB3-11957
[ticket/11957] More responsive forms adjustments

PHPBB3-11957
[ticket/11957] Responsive styles list

PHPBB3-11957
[ticket/11957] Misc responsive changes

PHPBB3-11957
[ticket/11957] Wrap content in double div

PHPBB3-11957
[ticket/11957] Add z-index to menu

Add z-index to menu to prevent content block from overlapping menu

PHPBB3-11957