core, plugin XEP-0115: discovery refactoring:

- hashing algorithm of XEP-0115 has been including in core
    - our own hash is still calculated by XEP-0115 and can be regenerated with XEP_0115.recalculateHash
    - old discovery methods have been removed. Now the following methods are used:
        - hasFeature: tell if a feature is available for an entity
        - getDiscoInfos: self explaining
        - getDiscoItems: self explaining
        - findServiceEntities: return all available items of an entity which given (category, type)
        - findFeaturesSet: search for a set of features in entity + entity's items
      all these methods are asynchronous, and manage cache automatically
    - XEP-0115 manage in a better way hashes, and now use a trigger for presence instead of monkey patch
    - new FeatureNotFound exception, when we want to do something which is not available
    - refactored client initialisation sequence, removed client.initialized Deferred
    - added constant APP_URL
    - test_plugin_xep_0033.py has been temporarly deactivated, the time to adapt it
    - lot of cleaning

src/memory/params.py

@@ -146,6 +146,7 @@ class Params(object):
 
     def asyncDeleteProfile(self, profile, force=False):
         """Delete an existing profile
+
         @param profile: name of the profile
         @param force: force the deletion even if the profile is connected.
         To be used for direct calls only (not through the bridge).
@@ -164,6 +165,7 @@ class Params(object):
 
     def getProfileName(self, profile_key, return_profile_keys = False):
         """return profile according to profile_key
+
         @param profile_key: profile name or key which can be
                             @ALL@ for all profiles
                             @DEFAULT@ for default profile