Unifying numpy syntax: main.py
Unifying numpy syntax: main.py

changes:
* from numpy import * ---> import numpy
So the numpy functions used in main.py change as:
ceil() ----> numpy.ceil()
zeros() ---> numpy.zeros()

Former-commit-id: f59f38c5b93d32a85c16145850898f083d1437de
barbagroup/pygbe,barbagroup/pygbe,barbagroup/pygbe