Properly clear cached files in gaussianTest.py
Properly clear cached files in gaussianTest.py

(afraid I wasn't able to test this as I don't have gaussian
 on this computer)
pierrelb/RMG-Py,pierrelb/RMG-Py,nyee/RMG-Py,nickvandewiele/RMG-Py,nickvandewiele/RMG-Py,nyee/RMG-Py