docs: def returnOneIndex(self, last=False):
          '''Return the first origin index (integer) of the current list. That
          index refers to it's placement in the original list of dictionaries.
          
          This is very useful when one wants to reference the original entry by
          index.
  
          Example of use:
  
          >>> test = [
          ...    {"name": "Jim",   "age": 18, "income": 93000, "order": 2},
          ...    {"name": "Larry", "age": 18,                  "order": 3},
          ...    {"name": "Joe",   "age": 20, "income": 15000, "order": 1},
          ...    {"name": "Bill",  "age": 19, "income": 29000, "order": 4},
          ... ]
          >>> print PLOD(test).returnOneIndex()
          0
          >>> print PLOD(test).sort("name").returnOneIndex()
          3
  
          :param last:
             The last origin of the current list is returned rather than the first.
          :return:
             An integer representing the original placement of the first item in
             the list. Returns None if the list is currently empty.
          '''
          if len(self.table)==0:
              return None
          else:
              if last:
                  return self.index_track.pop()
              else:
                  return self.index_track[0]