Major unfinished refactoring
Major ongoing refactoring and new code.  Full revamp of block handling and data type system
Completed major refactor and new block handling and data type system.
Fix RPC.  Add 'log' command.
Reworking block handler
Fixed memory issue by creating block handlers during 'serve' initialization instead of on-demand and per versioned service.
Fix artifact produced by incorrect use of leveldb iterator.
Fix XZ reconstruction