Tool CollapseMeshNode and associated class did not work in a correct way.
[MeshLib] All elements: Removed reviseElements().

This functionality will be substituted be an implementation from Karsten.
[MeshLib] TestMeshNodeSearch: fix warnings.
[MeshLib] TestMeshRevision: Removed debug code.
[MeshLib] TestMeshRevision: Fix warnings on travis.
[MeshLib] MeshInformation: Fix warnings on travis.
Merge pull request #353 from TomFischer/MeshLibCleanup

Cleanup in MeshLib: Removed reviseElement() methods.