New streaming API comments

1/ How to reset an Out/InputStream ?
There is a promising method BasicStream.reset() that allow stream recycling, but no clear equivalent in the user defined interfaces.
What is the behavior of the stream created by Ice.Util.createXXXStream(..) after a call to finish? Can it be reused for a new message?

2/ Useless code?
The BasicOutputStream is written as:

public class BasicOutputStream extends BasicStream
{
    public
    BasicOutputStream(Instance instance, Ice.OutputStream out)
    {
        super(instance);
        _out = out;
    }

    public Ice.OutputStream _out;
}

The _out argument is not used, and the only code that creates BasicOutputStream is in the OutputStreamI implementation:

public class OutputStreamI implements OutputStream
{
    public
    OutputStreamI(Communicator communicator)
    {
        _communicator = communicator;
        _os = new IceInternal.BasicOutputStream(Util.getInstance(communicator), this);
    }

The second (this) argument is used nowhere and adds no functionality.
Rewritting it as:

public class OutputStreamI implements OutputStream
{
    public
    OutputStreamI(Communicator communicator)
    {
        _communicator = communicator;
        _os = new IceInternal.BasicStream(Util.getInstance(communicator));
    }

have the same effect.
The BasicOutputStream class can be entirely removed without breaking any client.