Remove app-engine cruft
Rename bidder_handler to autobid_handler
Rename everything NewBidder to Bidder
Remove chrome frame support
Add back third_party symlink
Remove the old explorer
Move Explore2 to Explore
Delete more dead kbb code
Remove most of the PositionKnowledge code
Further simplification to HandConstraints
Remove needless deepcopy of CallHistory
Remove BidderProxy
Remove InterpreterProxy