[Stk] FileWvOut to append the sound

[Pavel Nikitenko]

Hello,

I use FileWvOut class for audio recording to file. But I observed, that:
wvOut = new FileWvOutEx(name, channels, FileWrite::FILE_AIF, 
Stk::STK_SINT16, 1024);

always opens new file and overwrites existing.
Could you help me/advice modification to FileWvOut to be able to append 
to existing file, instead of overwrite.

Thanks in advance,

Pavel