Handle private messages, both ways

src/irc/irc_client.hpp

@@ -75,6 +75,10 @@ public:
    * Return true if the message was actually sent
    */
   bool send_channel_message(const std::string& chan_name, const std::string& body);
+  /**
+   * Send a PRIVMSG command for an user
+   */
+  void send_private_message(const std::string& username, const std::string& body);
   /**
    * Send the PART irc command
    */