Implement a few more specialty remote newsgroup types

lib/nntp/tiny/remote.py

@@ -2,10 +2,33 @@ class RemoteException(Exception):
     pass
 
 class RemoteNewsgroup():
+    __slots__ = 'name',
+
+    def __init__(self, name: str):
+        self.name: str = name
+
+    def __str__(self):
+        return self.name
+
+class RemoteNewsgroupDescription(RemoteNewsgroup):
+    __slots__ = 'name', 'description',
+
+    def __init__(self, name: str, description: str):
+        super().__init__(name)
+
+        self.description: str = description
+
+    def __str__(self):
+        return "%s %s" % (
+            self.name, self.description
+        )
+
+class RemoteNewsgroupOverview(RemoteNewsgroup):
     __slots__ = 'name', 'low', 'high', 'post',
     
     def __init__(self, name: str, low: int, high: int, post: bool):
-        self.name: str  = name
+        super().__init__(name)
+        
         self.low:  int  = low
         self.high: int  = high
         self.post: bool = post