Integrate HXT for working XPath support.

Fix infinite loop in XPath parser preventing UI integration.

Allow searching for a descendant of a given element.

Attempted integration of XPath selectors.

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

Create pages describing elements & style Amphiarao.

Show syntax-highlighted start tags for elements in HTML UI.

Expose CSS selector search in UI FIXME: build the linked pages.

Refactoring, allowing reading which URL was loaded.

Allow loading webpage, commit missing files.