Conflicts: cmd/utils/cmd.go cmd/utils/flags.go core/manager.go eth/backend.go rpc/http/server.go xeth/xeth.go
block tests only need the chain, not all of ethereum.
* Add blocktest cmd and support for block tests files in tests/BlockTests , the launched node does not connect to network, resets state with a genesis block from the test file and starts the RPC API