* src/docgen/PdfDoc.py: proper handling of center_text * src/plugins/TimeLine.py: switch to using center_text instead of draw_text * src/plugins/AncestorChart2.py: switch to using center_text instead of draw_text svn: r2623
* src/docgen/PdfDoc.py: proper handling of center_text * src/plugins/TimeLine.py: switch to using center_text instead of draw_text * src/plugins/AncestorChart2.py: switch to using center_text instead of draw_text svn: r2623