core: added a mechanism to associate short names to namespaces:

- new internal registerNamespace can be used by a plugin to associate a short name to a namespace
- new NamespacesGet bridge method retrieve those associations

src/bridge/bridge_constructor/bridge_template.ini

@@ -763,3 +763,11 @@ doc_param_0=%(doc_profile_key)s
 doc_return=session informations, with at least the following keys:
     jid: current full jid
     started: date of creation of the session (Epoch time)
+
+[namespacesGet]
+type=method
+category=core
+sig_in=
+sig_out=a{ss}
+doc=Get a dict to short name => whole namespaces
+doc_return=namespaces mapping

src/bridge/dbus_bridge.py

@@ -383,6 +383,12 @@ class DbusObject(dbus.service.Object):
     def messageSend(self, to_jid, message, subject={}, mess_type="auto", extra={}, profile_key="@NONE@", callback=None, errback=None):
         return self._callback("messageSend", unicode(to_jid), message, subject, unicode(mess_type), extra, unicode(profile_key), callback=callback, errback=errback)
 
+    @dbus.service.method(const_INT_PREFIX+const_CORE_SUFFIX,
+                         in_signature='', out_signature='a{ss}',
+                         async_callbacks=None)
+    def namespacesGet(self, ):
+        return self._callback("namespacesGet", )
+
     @dbus.service.method(const_INT_PREFIX+const_CORE_SUFFIX,
                          in_signature='sis', out_signature='',
                          async_callbacks=None)