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Makes e.g. on-page anchor navigation near-instantaneous. Well, as
instantaneous as a fork can be. In any case, it's a lot faster
than loading the entire page anew.
This involves duplicating open resources (file descriptors, etc.),
which is not exactly trivial. For now we have a huge clone() procedure
that does an ok-ish job at it, but there remains a lot of room for
improvement.
e.g. cloning is still broken in some cases:
* As noted in the comments, TeeStream'ing the input stream for any
buffer is a horrible idea, as readout in the cloned buffer now
depends on the original buffer also reading from the stream. (So
e.g. if you clone, then kill the old buffer without waiting for
the new one to load, the new buffer gets stuck.)
* Timeouts/intervals are broken in cloned buffers. The timeout
module probably needs a redesign to fix this.
* If you clone before connect2, the cloned buffer gets stuck.
The previous solution was even worse (i.e. broken in more cases),
so this is still an improvement. For example, this fixes some issues
with mailcap handling (removes the "set the Content-Type of htmloutput
buffers to text/html" hack), does not reload all resources, does not
completely break if the buffer is cloned during loading, etc.
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