- Using a mutex to access the static QTextCodec. It's supposed to be reentrant, but all the cool kids are using mutexes these days, and it's an extra layer of bullet-proofing. Safety first!
- Also, it seems to be important that we attempt to pass the real length of the string to QTextCodec instead of always passing the max length of 16.

This fixes the crash I was seeing from running KPilot3 in a KDE4 session and I don't see the error from valgrind anymore either.