address @dignifiedquire rustyness comment and fix changelog

python/CHANGELOG

@@ -4,6 +4,12 @@
 - introduce automatic versioning via setuptools_scm, 
   based on py-X.Y.Z tags 
 
+- integrate latest DCC core-rust with dc_close() fixes
+
+- provide a account.shutdown() method  and improve termination
+  logic also in tests. also fixes output-clubbering during 
+  test runs. 
+
 
 0.600.0
 ---------

src/context.rs

@@ -135,7 +135,7 @@ pub fn dc_context_new(
     userdata: *mut libc::c_void,
     os_name: *const libc::c_char,
 ) -> Context {
-    let context = Context {
+    Context {
         blobdir: Arc::new(RwLock::new(std::ptr::null_mut())),
         dbfile: Arc::new(RwLock::new(std::ptr::null_mut())),
         inbox: Arc::new(RwLock::new({
@@ -179,8 +179,7 @@ pub fn dc_context_new(
         ))),
         probe_imap_network: Arc::new(RwLock::new(0)),
         perform_inbox_jobs_needed: Arc::new(RwLock::new(0)),
-    };
-    context
+    }
 }
 
 unsafe fn cb_receive_imf(