Epetra_Map -> create_VectorSpace() -> get_Epetra_Map() doesn't return the original map
Created by: nschloe
Given an Epetra_Map, one can convert it to a Thyra::VectorSpaceBase,
Teuchos::RCP<const Thyra::VectorSpaceBase<double>> space =
Thyra::create_VectorSpace(mymap);
When translating the result of this back to an Epetra_Map,
Teuchos::RCP<const Epetra_Map> spacemap =
Thyra::get_Epetra_Map(*space, comm);
it's not the same as the original map.
spacemap->SameAs(*mymap) // false
(From Sandia bug 6341.)