Visitors refactored to by used concurrently

...son/src/main/java/cz/fidentis/analyst/face/HumanFace.java

.../java/cz/fidentis/analyst/symmetry/SymmetryEstimator.java

...cz/fidentis/analyst/visitors/mesh/BoundingBoxVisitor.java

...is/analyst/visitors/mesh/HausdorffDistMeshTriVisitor.java

...entis/analyst/visitors/mesh/HausdorffDistMeshVisitor.java

...cz/fidentis/analyst/visitors/mesh/KdTreeBuildVisitor.java

.../fidentis/analyst/visitors/mesh/Point2MeshTriVisitor.java

.../cz/fidentis/analyst/visitors/mesh/Point2MeshVisitor.java

...z/fidentis/analyst/visitors/mesh/TriangleListVisitor.java

...identis/analyst/visitors/mesh/BoundingBoxVisitorTest.java

...nalyst/visitors/mesh/HausdorffDistMeshTriVisitorTest.java

...s/analyst/visitors/mesh/HausdorffDistMeshVisitorTest.java

...identis/analyst/visitors/mesh/KdTreeBuildVisitorTest.java

...entis/analyst/visitors/mesh/Point2MeshTriVisitorTest.java

...fidentis/analyst/visitors/mesh/Point2MeshVisitorTest.java

...dentis/analyst/visitors/mesh/TriangleListVisitorTest.java

...l/src/main/java/cz/fidentis/analyst/mesh/MeshVisitor.java

...rc/main/java/cz/fidentis/analyst/mesh/core/MeshFacet.java

...ain/java/cz/fidentis/analyst/mesh/core/MeshFacetImpl.java

...rc/main/java/cz/fidentis/analyst/mesh/core/MeshModel.java