[tremor] Recent Tremor commits

[Monty]

Hi folks,

I rolled a number of small-file fixes and seeking optimizations from
the mainline vorbisfile back into Tremor today.  It passes basic unit
tests, but of course this is not the same as getting banged on by the
collective entropy of the net.  Give it a whirl.

Also, Tremor on mainline is now the first deployment of the
experimental libogg2 memory management.  The intent here is to cut the
memory requirements of stream buffering to the absolute minimum.  It
also eliminates all memcopies between the various framing layers and
buffer shifting within layers.  On desktop processors the very tiny
benefit of eliminating the memory copies and shifts is offset by the
somewhat higher code overhead of managing the buffers, but it will
likely make some difference to embedded applications with slow memory.

Have fun testing.  More tremor work is coming up this week!

Monty
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