Add blocksonly mode

src/net.cpp

@@ -460,7 +460,7 @@ void CNode::PushVersion()
     else
         LogPrint("net", "send version message: version %d, blocks=%d, us=%s, peer=%d\n", PROTOCOL_VERSION, nBestHeight, addrMe.ToString(), id);
     PushMessage("version", PROTOCOL_VERSION, nLocalServices, nTime, addrYou, addrMe,
-                nLocalHostNonce, strSubVersion, nBestHeight, true);
+                nLocalHostNonce, strSubVersion, nBestHeight, !GetBoolArg("-blocksonly", false));
 }