Byzantium updates (#5855)

* EIP-211 updates

* benchmarks

* blockhash instruction gas cost updated

* More benches

* EIP-684

* EIP-649

* EIP-658

* Updated some tests

* Modexp fixes

* STATICCALL fixes

* Pairing fixes

* More STATICALL fixes

* Use paritytech/bn

* Fixed REVERTing of contract creation

* Fixed more tests

* Fixed more tests

* Blockchain tests

* Enable previously broken tests

* Transition test

* Updated tests

* Fixed modexp reading huge numbers

* Enabled max_code_size test

* Review fixes

* Updated pairing pricing

* missing commas (style)

* Update test.rs

* Small improvements

* eip161abc

json/src/state/test.rs

@@ -104,10 +104,12 @@ pub enum ForkSpec {
 	EIP158,
 	Frontier,
 	Homestead,
-	// TODO [ToDr] Deprecated
-	Metropolis,
 	Byzantium,
 	Constantinople,
+	EIP158ToByzantiumAt5,
+	FrontierToHomesteadAt5,
+	HomesteadToDaoAt5,
+	HomesteadToEIP150At5,
 }
 
 /// State test indexes deserialization.