[LAD] Update of zita-at1

Hello all, Zita-at1-0.8.1 is now available at the usual place: <http://kokkinizita.linuxaudio.org/linuxaudio/downloads/index.html> Note: this is not (yet) the new zita-at2 that will have formant correction. Changes: - Bug fixes. - Improved pitch estimation algorithm. - Low latency mode, reduces latency to around 10 ms. Note to Robin Gareus: The new Retuner class can probably be used without changes in the x42-autotuner plugin. The logic that controls jumping forward/back while resampling has been changed. Instead of just trying to avoid reading outside the available input range, it now tries to keep the read index as close as possible to the ideal position, i.e. 'latency' samples behind the write index. That also means that for unvoiced input it will be within +/- 1.3 ms of the ideal position, so nothing special is required for this case. Ciao, -- FA