Change History:

0.6.5

10 Sep 2004 Refactored in GDChart.py and ZGDChart.py for ease of
            testing. Added examples.

0.6.4

06 Apr 2003 Youenn Boussard adds a management screen to
            change pie chart preferences

0.6.3

24 Jun 2002 Dave Brueck <dave@pythonapocrypha.com> enables
            PythonScripts with ZGDChart
0.6.2

1 Dec 2001  Bug fix: getData renders on Netscape now
            Fabio Forno provided HILOCLOSE methods in _chartdata

0.6.1

3  Nov 2001 Dirk Datzert <dirk.datzert@rasselstein-hoesch.de>
            furnished ZBabelized version with German translation

0.6

15 Oct 2001 Updated to use Mike Steed's 0.6 and Python 2.1
            More virtual host friendly

0.5.1

30 May 2001 Updated to use Mike Steed's 0.6
            Supports TinyTables
0.5

15 Dec 2000 Updated to use Mike Steed's 0.5
            Dtml data method can take values from url
            index_html can now override default chart types
            using the 'zgdchart_runtime_type' parameter
            Updated demo

0.4.3b

26 Sep 2000 Patched in multiple series with SQL query

12 Sep 2000 Introduced technique to maintain 
            backward compatibility in the future, 
            using version_tuple_original

9 Sep 2000  Introduced new data method

31 Aug 2000 Uses CStringIO, fixed self.tempfile bug

29 Aug 2000 Graphs 2D and 3D chart styles
            Fix bug in Edit Scale tab
            Simplified form to instantiate class

28 Aug 2000 _chart is now thread-safe

18 May 2000 Urlencode encodes dates properly

12 Apr 2000 Fixes bugs introduced in 0.3.2
            Improved code readability 

