* Refactor blockchain.py into a few different files (difficulty_adjustment.py, block_header_validation.py)
* Faster sync pipelining of requests, and parallel verification (13 minutes to 9 minutes on 2 cores)
* Memory usage of node during sync is significantly reduced, only the latest blocks are in memory
* Networking fixes and logging levels changed
* SPECIFIC delivery which allows you to send messages to a specific node id
* Check plots acts like the normal harvester