Include "total consensus" split by relay type in vote totals graph

Totals of consensus weighs shift erratically due to some aspect of vote median behavior in the consensus. E.g. (Exit,Exit+Guard) moved 12.5% in 12 hours on 09-Jul-18 12:00 to 23:59 UTC while votes steady. Twenty percent in 56 hours with votes shifting. The behavior results in significant adjustment to the selection probability of relays with unchanged consensus weights. Please add to

https://metrics.torproject.org/totalcw.html

Suggest a separate weighted line for each effective class of relay, i.e.: (Exit,Exit+Guard),(Guard),(unflagged,Guard).