TPAC regression: searchbox no longer gets autofocus

[Dan Scott]

* Evergreen master

With the merging of autosuggest functionality, the overhaul of the search input box from a plain old INPUT element into a Dijit introduced a small regression: the searchbox lost autofocus. A small tragedy.

With user/dbs/restore_searchbox_focus in the working repo, we can reclaim autofocus without too much hackery. It's a small matter of an addOnLoad() call for the Dojo case, and adding the HTML5 "autofocus" attribute in the non-Dojo case. The latter won't work on Internet Explorer, so there's some room for doing browser detection and other Modernizr-like jiggery-pokery for the non-Dojo case, but then there wouldn't be much point of avoiding Dojo. So... let's keep the non-Dojo case as simple as possible.

[Mike Rylander (mrylander)]

Picked into master, hurrah!