top 3 now has percentages

The top 3 lists for addresses and percentages now also report what percentage of traffic they represent
Improved interaction between address_histogram and iptree

separated address_histogram iptree load and render

Loading values into an address_histogram from an iptree is now its own
operation which sets count_list and count_sum from tree data

iptree::sum() is added
iptree::size is made const

iptree::addr_elem now uses << for tostring

removed addr_elem::to_dotted_quad()
added operator<<(ostream, addr_elem)
modified users of to_dotted_quad() to use <<