Major items for next global release

  * Total build from source script

  * Shift to externally visible subversion repository **DONE**

  * Initial inclusion of ITK in computed fields, replacing existing image processing **DONE**

  * Remove computed variables by default **DONE**

  * Changed computed fields to use C++ instead of objects/methods implemented in C **DONE**

Major items for future releases

  * wxwidgets providing cross platform support for our major dialogs (currently only available for Motif)

  * mac support

  * Colour map spectra interface

  * Make image processing operations chain in ITK and remove requirement for mesh when only dealing with images.