Results 4 comments of Niloufar Abtahi

Thank you very much I have implemented both of the suggestions, to minimize the errors. I have not got any errors related to BoundingBox.h, but still a number of errors...

I have adapted the files for the installation with the 4th suggestion, Change uses of "RealVectorValue" to "libMesh::RealVectorValue" in your own code. Unfurthunetly, still I have errors as below: Compiling...

I have implemented **std::unique_ptr** in the old code, still, I get errors as below: [error.txt](https://github.com/libMesh/libmesh/files/2189697/error.txt)