code: def expand(self, process, child_nodes):
          
          #print('TODO: process check = ', process)
          #print(self.name, ' expanded to ->', child_nodes)
          self.child_nodes = []  
          for n in child_nodes:
              self.child_nodes.append(CoreData(n, parent=self))
docs: this expands a current node by defining ALL the 
          children for that process
          TODO = processes need to be recalculated