add remove transactions to Avatar model and add test for comparing remove transacions

...lator/directsimulation/AvatarSpecificationSimulation.java

...ractivesimulation/AvatarInteractiveSimulationActions.java

...vatarinteractivesimulation/AvatarMainCommandsToolBar.java

...eractivesimulation/JFrameAvatarInteractiveSimulation.java

...i/interactivesimulation/InteractiveSimulationActions.java

...ui/interactivesimulation/JFrameInteractiveSimulation.java

...a/ui/interactivesimulation/TaskTransactionTableModel.java

...c/test/java/tmltranslator/RemoveAllTransactionsTests.java