ZTUtils changes

  This file contains change information for the current release. 
  Change information for previous versions can be found in the
  file HISTORY.txt.

    Version 1.5

      Features Added

        - Added 'sequence_length' attribute to batches.      

        - Under Python 2.2, Iterator both accepts and produces Python
          iterator objects.

        - first() and last() methods allow you to tell whether the
          current element is different from the next or previous
          element.  This is most useful when the sequence is sorted.

      Bugs Fixed

        - Handle both string and class Unauthorized exceptions.

        - Batch construction masked sequence errors, such as
          Unauthorized.

        - Orphan defaulted to different values in different places.