4.2
 New Features
  - Availablity to create Gantt charts by using bar chart
 Changes
  - In combo chart column and area charts are drawn from their zero axis and 
    not from the bottom of the chart.
  - Axis positions can be set freely in combo chart (in the first axes
    element).
  - Calendarfields changed and added to match those defined in Java:
    - 'm' represents minutes instead of months
    - 'M' representes months
    - 'H' represents hours
    - 'S' represent milliseconds
  - Default time zone is changed from system default to GMT.
 Bug fixes
  - Invalid data elements in XML disappeared causing a shift in the rest of
    the values. Now the invalid values are treated as missing values.
 Java API changes
  - JoinedDataBuffer constructors can now take column ids from the columns
    itself, if an id list is not given.

4.1.1
 New Features
  - New maps for Thematic mapping extension: World, Projected USA, Europe.
  - valueAlignment attribute for map charts
  - "{.name}" macro can be used in valueFormat and annotations. It stands for 
    the series name in area, bar, column, line, pie, scatter, and stock charts.
 Changes
  - The order of drawing of map areas and hotspot has been changed. 
    All map areas are drawn first and then all hotspots are drawn.
  - Symbols (pointShapes) are centered in legend
  - Multiple HTML imagemap areas for shapes consisting of several polygons

4.1 
 New Features
  - Thematic mapping extension
  - Bea Workshop integration extension (beta)
  - SOM extension
  - EJB deployment model
  - Web Service deployment model (addChart and getChart services)
  - Visualization scales (color, paint, shape) enable association of additional values to data series
  - New legend types that support visualization scales (paint, shape)
  - The size of a legend can be set
  - The orientation of a legend can be set
  - Distance between the entries of a legend can be set
 Changes
  - dchart servlet renamed to getImage and class changed to com.davisor.webapp.chart.ChartContentServlet
  - External JSP attributes are taken from request object (was page)
  - <text> tag nested in <annotation> sets also "title" attribute used as tooltip in Mozilla. Explicitly given "title" attribute overrides it.