renaming GraphicalUserInterface as GUIMarkA
adding new GraphicalUserInterface class
renaming DisplayPanel as DisplayPanelMarkA
adding new DisplayPanel class
fleshing out new implementation of GraphicalUI
SemanticSolverImpl now controlling ERTask
tidying, minor refactoring
prepping introduction of ClueQueryTasks
adding ClueQueryManager
adding ClueQueryTask and fleshing out ClueQueryManager
refactoring ClueQueryTask mechanism