以太坊索引模块

在以太坊的区块结构内添加了一个索引结构，用于对区块链内存储的数据进行快速查询，主要修改了以下文件：

Name		Name	Last commit message	Last commit date
Latest commit History 4 Commits
.github		.github
accounts		accounts
build		build
cmd		cmd
common		common
consensus		consensus
console		console
contracts/checkpointoracle		contracts/checkpointoracle
core		core
crypto		crypto
dashboard		dashboard
docs/audits		docs/audits
eth		eth
ethclient		ethclient
ethdb		ethdb
ethstats		ethstats
event		event
graphql		graphql
internal		internal
les		les
light		light
log		log
metrics		metrics
miner		miner
mobile		mobile
mst		mst
node		node
p2p		p2p
params		params
rlp		rlp
rpc		rpc
signer		signer
swarm		swarm
tests		tests
trie		trie
vendor		vendor
whisper		whisper
.dockerignore		.dockerignore
.gitattributes		.gitattributes
.gitignore		.gitignore
.gitmodules		.gitmodules
.mailmap		.mailmap
.travis.yml		.travis.yml
AUTHORS		AUTHORS
COPYING		COPYING
COPYING.LESSER		COPYING.LESSER
Dockerfile		Dockerfile
Dockerfile.alltools		Dockerfile.alltools
Makefile		Makefile
README.md		README.md
SECURITY.md		SECURITY.md
appveyor.yml		appveyor.yml
circle.yml		circle.yml
interfaces.go		interfaces.go
rpc测试.md		rpc测试.md
修改文件.md		修改文件.md
命令行测试.md		命令行测试.md

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