added NaturalDiffIK::Mode

...er/CartesianNaturalPositionControllerWidgetController.cpp

...terface/core/CartesianNaturalPositionControllerConfig.ice

source/RobotAPI/libraries/aron/AronNavigator.cpp

source/RobotAPI/libraries/aron/AronNavigator.h

...e/RobotAPI/libraries/core/CartesianPositionController.cpp

source/RobotAPI/libraries/core/CartesianPositionController.h

source/RobotAPI/libraries/diffik/NaturalDiffIK.cpp

source/RobotAPI/libraries/diffik/NaturalDiffIK.h

source/RobotAPI/libraries/natik/CMakeLists.txt

...braries/natik/CartesianNaturalPositionControllerProxy.cpp

...libraries/natik/CartesianNaturalPositionControllerProxy.h

source/RobotAPI/libraries/natik/NaturalIK.cpp

source/RobotAPI/libraries/natik/NaturalIK.h