Support for Moving Data on SAMR Meshes

The Transfer package provides flexible, extensible support for a wide range data communication operations involving structured AMR patch hierarchies and levels. These classes are partitioned into two categories:

1. classes for data communication where all simulation data live on all patches on the patch levels involved
2. classes for data communication where simulation data live on subsets of patches on the patch levels involved, so-called 'locally-active' data

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