Strict validation transitions (#4988)

* ability to make validation stricter

* fix consensus

* remove logger

ethcore/src/spec/spec.rs

@@ -56,7 +56,7 @@ pub struct CommonParams {
 	/// Number of first block where EIP-98 rules begin.
 	pub eip98_transition: BlockNumber,
 	/// Validate block receipts root.
-	pub validate_receipts: bool,
+	pub validate_receipts_transition: u64,
 }
 
 impl From<ethjson::spec::Params> for CommonParams {
@@ -70,7 +70,7 @@ impl From<ethjson::spec::Params> for CommonParams {
 			min_gas_limit: p.min_gas_limit.into(),
 			fork_block: if let (Some(n), Some(h)) = (p.fork_block, p.fork_hash) { Some((n.into(), h.into())) } else { None },
 			eip98_transition: p.eip98_transition.map_or(0, Into::into),
-			validate_receipts: p.validate_receipts.unwrap_or(true),
+			validate_receipts_transition: p.validate_receipts_transition.map_or(0, Into::into),
 		}
 	}
 }