Adams/landau cleanup
Added mass matrix construction to GPU kernel to avoid problem with sparser mass matrix than Jacobian, messing up MatAXPY, rarely but unpredictably.
Added Kokkos solver st

Adams/landau cleanup
Added mass matrix construction to GPU kernel to avoid problem with sparser mass matrix than Jacobian, messing up MatAXPY, rarely but unpredictably.
Added Kokkos solver stubs to work with GPU offloaded matrices.
Fixed up ex2 for paper
Added runex2_[kokkos|cuda] targets to Landau makefile for paper

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Merge branch 'adams/landau-gpu-assembly' into 'master'

Adams/landau gpu assembly

See merge request petsc/petsc!3423

Adding Cuda and Kokkos assembly. Added Device assembly to Landau operator. Added Kokkos test mat/ex5k.

Merge branch 'adams/feature-dmplex-snes-landau-kokkos-barry-rebased' into 'master'

Adams/feature dmplex snes landau kokkos barry rebased

See merge request petsc/petsc!3050

Add a Landau collision operator, based on DMPlex and PetscFE, that uses p4est. It uses the new Kokkos interface and has a separate Cuda implementation. This could be deployed as 3rd party library, bu

Add a Landau collision operator, based on DMPlex and PetscFE, that uses p4est. It uses the new Kokkos interface and has a separate Cuda implementation. This could be deployed as 3rd party library, but this is easier to deploy to ECP, among other apps.

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