ENH: use unique_ptr for resource handling in dynamicMesh
ENH: defaulting for destructors where possible STYLE: clear() instead of setSize(0) for plain Lists STYLE: use bool operator instead of valid()/empty() for autoPtr tests
ENH: defaulting for destructors where possible STYLE: clear() instead of setSize(0) for plain Lists STYLE: use bool operator instead of valid()/empty() for autoPtr tests