Updates to FixRxKokkos ...
- Added templated computeLocalTemp<>() to FixRxKokkos but still using the original host data pointers.
- Updated the copy-back to dvector operation to be the same with RK4 and RKF45 per discussion with J. Larentzos.
TODO:
- Add kokkos data for computeLocalTemp and parallel_for loop.