Thread termination leads to FATAL Error in catch all blocks

[Joerg Kreuzberger]

Hi!
In PythonQtSlot.cpp there is an catch(...) section. This leads to an FATAL error cause on thread termination the abi::__forced_unwind exception is thrown on linux.

There for you have to
- rethrow the exeception and handle it in the catch expressions
- rethrow the the exception in the catch(...) block.

[Joerg Kreuzberger]

Attached is a patch to catch the exception in a proper way.

This is very helpful if you have to release the GIL in a proper way on thread termination

[Florian Link]

I added the patch to the trunk.