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1.6.4: sockbuf changes

The class sockbuf has been modified so that it derives from seqbuf. The virtual functions in seqdev needed for seqbuf to function correctly, have been added to sockbuf. Thus a sockbuf becomes a fully functional streambuf. In this way, the code that "understands" how to do streambuf buffering has been moved from sockbuf to seqbuf.