put back checkTD and unskip incorrectTD test

blockpool/blockpool.go

@@ -785,10 +785,10 @@ func (self *BlockPool) checkTD(nodes ...*node) {
 		if n.td != nil {
 			plog.DebugDetailf("peer td %v =?= block td %v", n.td, n.block.Td)
 			if n.td.Cmp(n.block.Td) != 0 {
-				//self.peers.peerError(n.blockBy, ErrIncorrectTD, "on block %x", n.hash)
+				self.peers.peerError(n.blockBy, ErrIncorrectTD, "on block %x", n.hash)
-				//self.status.lock.Lock()
+				self.status.lock.Lock()
-				//self.status.badPeers[n.blockBy]++
+				self.status.badPeers[n.blockBy]++
-				//self.status.lock.Unlock()
+				self.status.lock.Unlock()
 			}
 		}
 	}

blockpool/errors_test.go

@@ -128,7 +128,7 @@ func TestErrInsufficientChainInfo(t *testing.T) {
 }
 
 func TestIncorrectTD(t *testing.T) {
-	t.Skip() // @zelig this one requires fixing for the TD
+	// t.Skip() // @zelig this one requires fixing for the TD
 
 	test.LogInit()
 	_, blockPool, blockPoolTester := newTestBlockPool(t)