[EM] List PR

[Forest Simmons]

I don't see any obvious way of improving on Craig's idea for modifying
open list PR in the context of many winner elections.

For two or three winners, I think that PAV (Proportional Approval Voting)
is the best. 

Around half a dozen winners, perhaps some version of STV would be most
practical.

With a dozen or more winners some form of list PR seems the most practical
to me, though my intuition isn't as far advanced as Craig's on this.

Forest