Crashes during repeated recording and playback

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Sometimes (very irregularly), after recording or playback in a loop, pulseaudio starts complaining about buffer underruns. Then, more and more slow-down manifests, until the program is unusable or crashes. Two main theories:

• we seem to be using pulseaudio wrong (well, the documentation is not the most helpful)
• something wrong with SignalChain and threads

This issue has been around for a long time. I just want to migrate from my internal bug tracker into the public space, giving more pressure...

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Well, pulseaudio is still complaining, but I fixed the slow-down and crash!

Problem was, we were saving all the warning messages in the log system (including additional data). And since the rate of these messages was so high, we simply ran out of memory.

So, as a quick fix, we now ignore messages, that occur to often :P

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This is kind of fixed, by now.

(there are still more annoyances with pulseaudio, but this specific issue has been resolved)