Activate root logger if not configured yet

[jotelha]

This is necessary for CLI applications to actually print logging information to stdout.

Without these two lines, the logger of intermol does not print anything to the command line when the application is called from the command line, even if specifically requested with the --verbose flag.

As an example, I have been using intermol with this command:

intermol-convert --gro_in default.gro system.top --lammps --oname converted --energy --lmppath $(which lmp) --gropath $GMXBIN --verbose

and would only see a single line printed directly with a print statement in the convert.py file.

{'lammps': 12057.699850550001}

[ctk3b]

Thanks for the fix!