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Possible upgrades to gzfilebuf:
- The ability to do putback (e.g. putbackfail)
- The ability to seek (zlib supports this, but could be slow/tricky)
- Simultaneous read/write access (does it make sense?)
- Support for ios_base::ate open mode
- Locale support?
- Check public interface to see which calls give problems
(due to dependence on library internals)
- Override operator<<(ostream&, gzfilebuf*) to allow direct copying
of stream buffer to stream ( i.e. os << is.rdbuf(); )