phobosx.signal version 0.3 released

[Robert]

Thanks to Denis Shelomovskij for pointing out that due to 
compiler optimizations the "Heisenbug" was still present in my 
code, just very unlikely to trigger in practice. It should be 
fixed for real now. I'll sleep over it and check it more 
thoroughly again in the next days. Denis, I would appreciate it 
if you might check if it looks good to you now.

Best regards,

Robert