The jurisdiction directories here contain the data that will go
onto the DVDs.

For example, under the 'Hobart' subdirectory is the filesystem
that will exist in the root directory of the created Hobart DVD.

Other files/directories at the top level are used to build the
four jurisdiction DVD directories:
. BatemansBay
. Gosford
. GoldCoast
. Hobart

Use the 'update_DVD_images.py' program to refresh everything under
the <jurisdiction> directory.

If you edit anything in the jurisdiction directories (Hobart, etc),
you WILL LOSE DATA, as everything in those directories comes from
somewhere else.

When you run 'update_DVD_images.py <jurisdiction>', the following happens:
1. The <jurisdiction> directory is deleted.
2. Selected files are copied from the jurisdiction working directory into
   a new DVD jurisdiction directory.
3. All files/directories under the 'extra_files' directory are copied to the 
   new DVD jurisdiction directory, unless it's a directory and it has a
   jurisdiction name.
4. Any directory under 'extra_files' that has a jurisdiction name is copied
   to the root of the DVD jurisdiction directory *if* the jursidiction
   name matches the name of the directory.  Note that this includes a jurisdiction
   'project' directory containing modified versions of project.py, etc, that
   must be changed on the DVD.