Alpha:
 - Check for undocumented functions
 - Fix scaling of background image
 - Tresh hold for pie charts

Next steps:
 - 3D-Renderer
   - Inaccurate rendering for line charts
   - z-Bffer problems for pie charts
   - Symbol priority wrong
 - Enhance font configuration with magic
 - Return datapoinnt positions for imagemap and / or adding additional 
   information with div overlays
 - TextElement to add copyright info etc.
 - GD-Driver
   - Antialiasing of lines
 - Datasets
   - FromPDO
   - Average (polynomial)
 - Axis
   - Logarithmical scaled axis
   - DateAxis
 - Chart types
   - Bar charts
   - Radar charts
     http://www.aditus.nu/jpgraph/img/gallery/radarlogex1.png
   - "Filled" line charts (combine with normal line charts)
     http://www.aditus.nu/jpgraph/img/gallery/example17.png
 - Driver
   - Flash
 - Elements
   - Shadows for elements like legend, chart, textboxes, etc.
 - Datasets
   - Average (Bezier, Besplines)