Stability of our beta

[David nolden]

I've implemented and checked in my workaround now, and it seems to work very 
well. I've at least parsed full kdelibs with 2 parsing-threads on my dual-core 
machine without a crash.

Since i've also fixed some other crashes within the last days, and the 
completion features I've added are low-risk while adding good value, I suggest 
the current revision as new beta tag.

Greetings, David