Update IntegralInvariant in VCM PR

# Integral Invariant modification

- Moving old IntegralInvariant estimators to ```deprecated``` namespace ( ```IntegralInvariantGaussianCurvatureEstimator``` ```IntegralInvariantMeanCurvatureEstimator``` ```IntegralInvariantNormalVectorEstimator``` )
- Modification of IntegralInvariant tests and examples in order to use the new estimators
- Add some 3D functors in IIGeometricFunctors (k1,k2,Gaussian)
- Fixing issue with small radius for IntegralInvariant estimators

# General modification

- Update to last version of DGtal
- Removal of some warnings ...