2933 Tag Wrangling link for admins, search tip scrolling, update static pages

http://code.google.com/p/otwarchive/issues/detail?id=2933

* Add a Tag Wrangling link to the admin navigation (link destination okayed by TW chair)
* Fix issue with the search tip causing horizontal scrolling
* Update header and footer on static pages for 500 and 502 errors and maintenance and placeholder messages