PeerFinder fixes:
* Fix split horizon using recent address cache
* Change message tuning parameters to reduce dead messages
* Improved peer handout algorithm for addresses
* Improved handout algorithm for redirects
* Faster autoconnection strategy
* Consolidate deadline timers
* Send empty endpoints message as a socket ping
* Fix hop count adjustments for live cache filtering
* Remove broken Peer::isConnected function
* Optimized Livecache for handouts
* Add histogram to Livecache print output