Adds new wrapper divs to the main column and tabs for more flexibility
in child themes.
Styling of new blocktype panel (see bug #808601)
Many other miscellaneous fixes, including to the dropdown menus

Signed-off-by: Richard Mansfield <richard.mansfield@catalyst.net.nz>

Change-Id: Ie1de1861d967bb6e954bdb41c792c268245f6bb8
Author:    Evonne Cheung <evonne@catalyst.net.nz>