Renamed DifferentialActionModel API
Before making any abstract class for DAM models, I have to create an standard API for DAM models. Doing that, it required to take the following actions:
- Renaming DifferentialActionModel to DifferentialActionModelManipulator
- Moving the DAMManipulator class from differential_action.py to manipulator.py
- Passing costModel for the construction of DAMManipulator (similarly to DAMFloatingInContact)
- Adapting the example and unit-test scripts that depend on DAMManipulator.