2d Local Estimators Tools update

- curvatureMCMS and estimatorComparator have been updated according DGtal bug fixes and evolutions (issue #22)
- estimatorComparator, which has been renamed into 2dLocalEstimators, has now an option in order to enable or disable the estimations returning by: 
  - the BC-based method, 
  - the maximal DSS-based method, 
  - the maximal DCA-based method, 
(issue #12 and discussion)