stable version of C++ loads, no longer crashes on second run

ale/__init__.py

ale/drivers/__init__.py

ale/drivers/base.py

ale/drivers/cassini_driver.py

ale/drivers/lro_driver.py

ale/drivers/mdis_driver.py

ale/drivers/mro_driver.py

notebooks/Untitled.ipynb

notebooks/cpp_load.ipynb

tests/ctests/AleTest.cpp

tests/ctests/CMakeLists.txt

tests/pytests/test_lro_drivers.py