added Duplicate namespace
removed element copy functionality from MeshRevision
added functionality to subdivide mesh elements without collapsing nodes
added tests and removed test functionality
added missing test
added method for calculating centre of gravity for elements
changed surface normal calculation to Vector3
adjusted all locations for surface normals are needed
changes based on PR comments
Correct includes and namespaces in Test.
Squash. Whitespaces.
Replace copyX by a copyElement<X> template.
[MeshLib] Element: Removed unused lines.
Merge pull request #6 from endJunction/MeshRevisionSubdivision

Mesh revision subdivision
added method to element classes to test the node ordering
added node ording test to validation method of element types
updates MeshAnalysisDialog to display node ordering errors
adjusted documentation
Merge pull request #376 from rinkk/MeshRevisionSubdivision

Creating duplicates of mesh components
Style: Reordering includes, move include to cpp.