Sort out the module index (ty @ascjones)

Sort out the RefCount type (ty @dvc94ch)
Random tweaks to make test-node more similar to the vanilla node-template

test-node/src/chain_spec.rs

@@ -101,7 +101,7 @@ pub fn development_config() -> Result<ChainSpec, String> {
         // Properties
         None,
         // Extensions
-        None,
+        Default::default(),
     ))
 }