Add a RAII GIL Release object

Signed-off-by: Jan Losinski <losinski@wh2.tu-dresden.de>
Wrap the calculation in a Gil-Release-function

Signed-off-by: Jan Losinski <losinski@wh2.tu-dresden.de>
Export the new gil-free calculation

Signed-off-by: Jan Losinski <losinski@wh2.tu-dresden.de>
Use GIL-Free calculation

Signed-off-by: Jan Losinski <losinski@wh2.tu-dresden.de>