Extra domain info

Added domains crawled and uncrawled to links page.
Seems preferable if we don't bother with a `needNotCrawled` flag and just return linksUncrawled every time.

Even as-is the performance cost seems trivially, but even if iterating the links again seems overly costly, couldn't we keep this count as we iterate through the links? For example increment a counter very time we see a NotYetCrawled link, and every time we are going to replace a link in the `found` map, if the link we are replacing is NotYetCrawled, then decrement the counter. Do you think that would work?