Respond to MAM requests on a channel JID

At the moment, result-set-management is not implemented, the whole history
(well, at most 1024 messages) is returned.

src/xmpp/biboumi_component.hpp

@@ -9,6 +9,10 @@
 #include <string>
 #include <map>
 
+namespace db
+{
+class MucLogLine;
+}
 struct ListElement;
 
 /**
@@ -82,6 +86,12 @@ public:
   void handle_message(const Stanza& stanza);
   void handle_iq(const Stanza& stanza);
 
+#ifdef USE_DATABASE
+  bool handle_mam_request(const Stanza& stanza);
+  void send_archived_message(const db::MucLogLine& log_line, const std::string& from, const std::string& to,
+                             const std::string& queryid);
+#endif
+
 private:
   /**
    * Return the bridge associated with the bare JID. Create a new one