Add support for Crusher

[Rombur]

With this PR I can pass the test suite on Crusher. The changes made are:

• MapFactory package has been removed
• Interface package has been removed (not sure what it means for our link with ForTrilinos)
• Fix all the instances where we assumed that Unified Memory was enable

[masterleinad]

Why did you remove MapFactory and Interface?

[Rombur]

Because there are not used and the tests assume we use CUDA

[aprokop]

Are we sure that these are not used by any external users (e.g., ExaAM)?

[Rombur]

I thought ExaAm stopped using DTK when they stopped using Truchas

[aprokop]

I thought ExaAm stopped using DTK when they stopped using Truchas

Correct in the case of Truchas. But it's now being used in ExaCA. Per John Coleman:

I have integrated DTK into a branch of ExaCA, but it is not in the standard release yet. We were using it
to interpolate thermal data from a finite volume heat transfer model to a cellular-automata grain structure
model for solidification in additive manufacturing.

[Rombur]

That's a C++ code using Kokkos. It's probably cleaner if they don't use the C interface.

[aprokop]

I'm not sure how it does that, I have not seen the dtk branch.

[Rombur]

John is OK with us removing Interface

[aprokop]

John is OK with us removing Interface

And MapFactory?

[Rombur]

Yes MapFactory too.