added Stream:foreach(), Stream:pipe() and Stream:gnuplot() methods

 * Stream:foreach() is also useful on the command line.
   It is used to apply a function to all samples of a stream
   as fast as possible. Some existing methods have been simplified using foreach()
 * an alternative to foreach() would be to use Streams exclusively to
   introduce side-effects into sample processing and provide a simple method
   like sink() to fetch all samples as fast as possible.
   Other methods like save() could then be simple wrappers

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