handle negative coordinates for pd META regex, add doc/* directory search trigger, various refactoring

change id to the document's full path-- this will make it easier to fetch specific documents from the index when displaying directory contents

* don't put patch body in index... just use keywords
* index entire "doc" directory (recursively)

take patch file content out of the search index, clean up dialogwin references when window gets closed

first draft of a search engine (powered by elasticlunr). We're just using the release file for elasticlunr here. It might make more sense to do it as a gitsubmodule.