Integrate HXT for working XPath support.

Attempted integration of XPath selectors.

Draft an XPath parser.

Add search by tag name to JSON interface.

(Search by CSS selector seems close enough in the HTML interface that this wouldn't be useful.

Support searching for links by label, both in JSON & HTML interfaces

Add support for querying elements by CSS selector.

Uses a fork of the  hackage, altered to use  as a lexer.

Parse web (or Gemini) pages & extract title.