Add two streams with self += other.
It will extend the current Stream object with the traces of the given Stream. Traces will not be copied but references to the original traces will be appended.
Parameters: other (Stream or Trace) Stream or Trace object to add.
>>> stream = Stream([Trace(), Trace(), Trace()]) >>> len(stream) 3
>>> stream += Stream([Trace(), Trace()]) >>> len(stream) 5
>>> stream += Trace() >>> len(stream) 6