0.20.0

• Add: new CLI parameter '-timeout' to specify DB connection timeout in the case of using MongoDB replica sets (Issue #589).
• Fix: All convenience operations to use the service routines of standard operations (Issue #117)
• Fix: Correct rendering of response to convop "POST /v1/contextEntities/{entityId::id}/attributes/{attributeName} (Issue #772)
• Fix: Made 'POST /v1/contextEntities/{entityId::id}' and 'POST /v1/contextEntities' accept entity::id and entity::type
  in both payload and URL, as long as the values coincide.
• Fix: A few more of the 'responses without entityId::type filled in' found and fixed (Issue #585)
• Fix: The convenience operations "/v1/contextAttributes/{entity::id}/attributes" now share implementation with
  convenience operations "/v1/contextAttributes/{entity::id}" and are thus 100% identical.
• Fix: The convenience operation "PUT /v1/contextAttributes/{entity::id}/attributes/{attribute::name}" had a bug
  about the metadata in the update, this error has been fixed.
• Fix: A registerContext request that uses associations must specify "attributeAssociations" instead of "attributes" to be consistent with DiscoveContextAvailability messages (Issue #823).
• Fix: Fixed a bug that made the broker crash when compound attribute values were used in convenience operations.
• Fix: Implemented URI-parameter 'notifyFormat=XML/JSON' for NGSI9 subscriptions.