Changed defaults for morris_oat.py
Changed defaults for morris_oat.py

Changed defaults for grid levels and grid jump size to those
recommended in Saltelli 2008 (4 and 2 (2/3) respectively).

willu47/SALib,willu47/SALib,SALib/SALib,jdherman/SALib,jdherman/SALib,dhadka/SALib,t2abdulg/SALib