plugin XEP-0277: don't wrap `DataError` in `failure.Failure` in `parseCommentUrl` as it is not catched correctly: `failure.Failure` is subclass of `BaseException` but not of `Exception`, as a result `except Exception` doesn't catch it correctly. This is fixed by not wrapping `DataError` in `failure.Failure` anymore.

You'll find install instructions in documentation (see doc/installation.rst).

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