Make Diviner's "advanced search" a little less derp

Summary: Ref T988. This layout got mucked up a while ago, restore it to some semblance of sanity and give it a couple of basic search options.

Test Plan: Searched for stuff. Woooo~~

Reviewers: btrahan, chad

Reviewed By: chad

CC: aran

Maniphest Tasks: T988

Differential Revision: https://secure.phabricator.com/D8419