More zlib...

One more patch for today, allowing the DeflateStream to
decorate not 
only a ReadStream but also a WriteStream.  To do this, I
just added a 
generic class to turn a ReadStream decorator into a
WriteStream 
decorator (the PipeStream).

More practically, this means that you can do:

    fs := FileStream open: 'foo.gz' mode: 'w'.
    gzipStream := GZipDeflateStream compressingTo: fs.
    Object fileOutOn: gzipStream.
    gzipStream close.
    fs close.

Paolo

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