* PIP Table Cost relative to average peers instead of max peers
* Add tracing in PIP new_cost_table
* Update stat peer_count
* Use number of leeching peers for Light serve costs
* Fix test::light_params_load_share_depends_on_max_peers (wrong type)
* Remove (now) useless test
* Remove `load_share` from LightParams.Config
Prevent div. by 0
* Add LEECHER_COUNT_FACTOR
* PR Grumble: u64 to u32 for f64 casting
* Prevent u32 overflow for avg_peer_count
* Add tests for LightSync::Statistics