message: more cleanups in maml::Context --> fix public visability of private items
  [ci skip]
diff: @@ -58,6 +58,10 @@ namespace maml {
  stopped */
  void send(std::shared_ptr<Message> msg);
  + private:
  +
  + // Helper functions //
  +
  /*! the thread (function) that executes all MPI commands to
  send/receive messages via MPI.
  @@ -83,10 +87,6 @@ namespace maml {
  put into the inbox */
  void processInboxThread();
  - private:
  -
  - // Helper functions //
  -
  void sendMessagesFromOutbox();
  void pollForAndRecieveMessages();
  