* ported Region.java util class from knowrob_mesh_reasoning package and
removed its local duplicate
* changed method reloadVertexList access from private to public
* added regions property field to model instances
* added getter/setter to regions property
* added method to return HashMap of <Integer,Region> type for model
regions
* added method to check if Edge object has a given Vertex
* fixed bug on getSharpEdges method for the case where 1 sharp vertex was
present
* added method to return commond Edge of two Triangle objects
* changed method setCurvatureLevels access modifier from private to public