Conflicts:
	cmd/blocktest/main.go
	cmd/mist/debugger.go
	cmd/utils/cmd.go

Help for a specific command now shows available subcommands.

Add empty total difficulty to test blocks and clean up stopping the node

Poc9/cli (exportchain)

[WIP] Poc9/natspec

The interface has moved to package xeth because that's where it is
actually used.

Conflicts:
	cmd/utils/cmd.go
	cmd/utils/flags.go
	core/manager.go
	eth/backend.go
	rpc/http/server.go
	xeth/xeth.go

This should make calls faster and removes interaction
with account manager.

This will simplify the next commmit. Hash was only used for logging.

block tests only need the chain, not all of ethereum.