This folder contains the extensions that have been added to BlueSpray.
Extensions need to be compiled "jar" files containing subclasses of an
extension class from the SchoonerTurtles code base.  This includes:

- STProjector - code to project from one projection system to another
- STIO - code to handle a file, webservice, or database connection
- STPainter - code to render data to the screen (2d or 3d)
- STTool - new tool button and/or tool panel?

- STTransform - code to process data that is not a subclass of STTransform

Future additions?
- STFormat - convert from a data format (i.e. KML) to a SchoonerTurtles format?
- STItem - new document item?
- STScript - new script language?
- STLayer - new type of spatial data

