TODO

- output a complete evalStack trace with line numbers.  This would help
  debugging errors in generated code

- Will need sections in the manual for the docs about each renderer module, or
  possibly each module supplies their own.
  (added Wed Jan 12 08:54:18 2005, incomplete, priority verylow)

- Implement mesh plots in vtk
  (added Wed Nov  9 14:54:55 2005, incomplete, priority low)

- Some of the code in LinePlot.setData() should be in LinePlot.render()
  (added Thu Nov 10 17:35:03 2005, incomplete, priority low)

- Need a log output file for user- and developer- debugging information.
  (added Fri Jan 21 14:09:26 2005, incomplete, priority medium)

- At present, can only have one kind of linestyle per graph.  We need a way to
  specify different linestyles for each individual line on a multi-line graph if
  desired.
  (added Mon Jan 24 15:56:19 2005, incomplete, priority medium)

- Need to keep a count of the number of a given type of object exists within a
  scene so that can have many of the same type of object in a scene (stops
  overwriting objects in autogenerated code).
  (added Thu Jan 27 13:49:23 2005, incomplete, priority medium)

- Add options dictionaries to objects, so that things like xlabel, ylabel etc
  can be set at object instantiation time.
  (added Thu Feb 24 13:46:31 2005, incomplete, priority medium)

- implement surfaceAndContour plots in vtk
  (added Wed Nov  9 14:55:07 2005, incomplete, priority medium)

- Implement scatter plots (2D and 3D) in vtk
  (added Wed Nov  9 14:55:34 2005, incomplete, priority medium)

- Refactor the code in plot.py - it really needs it!
  (added Thu Nov 10 17:22:07 2005, incomplete, priority medium)

- Make custom classes/methods/whatever for common error messages
  (added Thu Nov 10 17:23:15 2005, incomplete, priority medium)

- Implement ArrowPlot3D objects in gnuplot
  (added Wed Nov 30 14:35:14 2005, incomplete, priority medium)

- In the Scene.save() method determine the format by the image filename
  extension, and if not possible use some intelligent default
  (added Thu Jan  5 09:59:50 2006, incomplete, priority medium)

- Need to separate out various tasks in setData() into their own methods.  Such
  as setEscriptData() and setDataFromFile() etc.
  (added Thu Jan  5 13:41:51 2006, incomplete, priority medium)

- Fully implement linestyles in renderers.vtk
  (added Fri Jan 21 13:44:45 2005, incomplete, priority high)

- View vtk structured and unstructured meshes
  (added Thu Feb 24 13:52:03 2005, incomplete, priority high)

- Handle multiple data sets and data types in one vtk file
  (added Thu Nov  3 12:04:50 2005, incomplete, priority high)

- Remove running the initString more than once in a given script
  (added Wed Nov  9 14:54:19 2005, incomplete, priority high)