changed semantics of the __call metamethod: create VectorStream

 * the call metamethod is most useful in compositions in order to
   evaluate a stream to save computing power at runtime.
 * this meant that in addition to adding () to a stream expression it
   was necessary to convert the table to a stream (e.g. using tostream()).
 * Now the totable() method converts to a pure table, while __call
   returns a VectorStream. This means it will be sufficient to add "()"
   in order to evaluate a stream eagerly

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