new_contents: import numpy as np;
  import logData;
  
  xdim = 10;
  ydim = 10;
  filename = 'test.nc';
  fields = ['pv', 'vort'];
  
  logger = logData.logData(filename, fields, ['xdim','ydim'], [xdim, ydim]);
  
  pvField = np.zeros((xdim,ydim));
  vortField = np.zeros((xdim,ydim));
  
  logger.writeData([pvField, vortField]);
  logger.writeData([pvField, vortField]);
  logger.writeData([pvField, vortField]);
  logger.writeData([pvField, vortField]);
  logger.writeData([pvField, vortField]);
  
  
  logger.finishLogging();
  
subject: test script for the logging module