Changes for 1.1.0 -> 2.0.0 Deployment strategy decisions (#126)

* make slate v0 the default for regular sends

* add block_header_version to slate

* update doc tests for latest grin version

* rustfmt

* HACF if HF height detected

* rustfmt

impls/src/node_clients/http.rs

@@ -40,6 +40,11 @@ impl HTTPNodeClient {
 			node_api_secret: node_api_secret,
 		}
 	}
+
+	/// Allow returning the chain height without needing a wallet instantiated
+	pub fn chain_height(&self) -> Result<u64, libwallet::Error> {
+		self.get_chain_height()
+	}
 }
 
 impl NodeClient for HTTPNodeClient {