adjusted existing classes to new DuplicateMeshComponent methods
removed unnecessary includes
changed signatures to return the number of found elements
adjusted utility for mesh element removal to use ElementExtraction class
Fixed warning: unused variable ‘node_id’.
Removed unused code in TestTriLineMesh.
Merge pull request #8 from TomFischer/InconsistentMeshFix

Fix two warnings.
fixed two more warnings
Merge pull request #386 from rinkk/InconsistentMeshFix

Removal of duplicate code in MeshLib