This variable should only be set by the Database when a DatabaseItem is
first created. This means I should hide _index from the rest of the
world to prevent accidental modifications. I also add an accessor
function for other code that needs to read _index.
Signed-off-by: Anna Schumaker <Anna@OcarinaProject.net>
I move all of the core tests into the core/ directory to keep them
together. Gui unit tests will be put in new directories.
Signed-off-by: Anna Schumaker <Anna@OcarinaProject.net>