* Move BeaconNode type to its own file (fewer imports)
* disentangle sync protocol/request manager
* fix some old nimisms
* de-fear some logs
* simplify eth1 data production
* add stack tracing to release builds
* drop release compile flag for testnet
* Delete the node database on all containers when resetting a testnet
* Add a simple mechanism for switching the URL of the eth2-testnets repo
* More flexible code for validator assignments
Zahary Karadjov
Jacek Sieka