MEDIUM: halog: add support for counting per source address (-ic)

MEDIUM: halog: add support for counting per source address (-ic)

This is the same as -uc except that instead of counting URLs, it
counts source addresses. The reported times are request times and
not response times.

The code becomes heavily ugly, the url struct is being abused to
store an address, and there are no more bit fields available. The
code needs a major revamp.