Create grade_cpp_NG.py
Create grade_cpp_NG.py

more nicely structured (according to grade_cs), 

does not uses jail or safeexec for now -- good for sandbox env

does not suport C++func tests
dz0/websheets,dz0/websheets,dz0/websheets,dz0/websheets,dz0/websheets,dz0/websheets