hi. I'm trying to configure some of the magics with ipython 4.1.1 so they are using the convenient executable path (eg. from a virtual environment). I have seen that it looks like in Ipython\core\magics\script.py, it should be possible to modify this through script_paths Dict... However I'm not able to add the paths... I'm not very familiar with the trailet elements/methods... Could it be possible to know how to add one element to this kind of Dict?