Major restructuring of how streams work. Neither input nor output
streams are now blocking. This avoids stalling the rest of the client or
server when a peer is slow or unresponsive.

Note that this puts an extra burden on users of streams to make sure
they are allowed to do their work once the underlying transports are
ready (e.g. monitoring fds).

Most streams are backed by a memory buffer. Create common base classes
for this functionality to avoid code duplication.

Provides safety against them accidentally becoming negative because
of bugs in the calculations.

Also does the same to CharArray and friends as they were strongly
connection to the stream objects.

This allows us to simplify things by getting rid of some old
compatibility code. People should really be using current versions
of GnuTLS anyway to stay secure.

containing stream object. This is in preparation for supporting GnuTLS 3.x.


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