Remove a forgotten read of a nonexistent parameter.
Fix wrong testcases still working.
Hide from the documentation a class that is not part of the interface.
Remove a forgotten read of a nonexistent parameter (continued).
Make DataResponse.error similar to MetadataResponse.error; now error(msg) issues a generic exception; to issue a SubscriptionException, use error(msg,"subscription").
Revise the inline documentation and add notes on exceptions.
Fix incorrect parsing on notifyUser.
Include the extension on exception management

Introduce the changelog
Fix a previous fix on notifyNewSession
Revise the metainformation to comply with this branch