Moved InfoToolbar into the Infopanel package.
Rejigged the package structure of the GUI.
Rejigged the package structure of the GUI. Again.
Finally got around to renaming from MapTool to LevelTool.
Converted the ExitTool to an abstract class.
Added a method to return the Level corresponding to the Cell.
Factored out all common behaviours/activities that can be done to a Cell into its own class.
Added Javadoc.  Handed responsibility for Connection deletion over to the Deletion tool.
Decomposed the primary deletion method into smaller methods, and added functionality so that exits would be properly deleted from rooms on either side of a deleted Connection.
Moved to a new directory.  Added Javadoc.
Changed the LevelTool back to an interface.
Added Javadoc.  Renamed some methods.
Added some new JavaDoc and did a general code cleanup.