Redesign of the "new search UI" per Trevor's design plans from usability wiki:

Redesign of the "new search UI" per Trevor's design plans from usability wiki:
* simplify everything, move search box to top
* move header below it and make it google-style
* move styles from monobook into shared since people didn't really customize it
* remove some old unused stuff like default+project namespaces and such

Things to do still:
* smarter detection of prefix searches
* javascript to link to correct link when typing in a query, but clicking on one of the search headers
* prev/next still uses MW default navigation, should be replaced with tango icons?
* test a bit more with default search backend (i.e. mysql)