* SubGrids are now properly distributed among MPI nodes.

- RuntimeMPI can now build subGrids on each node (but each node also has
a globalGrid).
- Rename field RuntimeMPI::grid_manager -> RuntimeMPI::globalGrid
- Added field RuntimeMPI::subGrid.
- MPI test and utility programs need no longer ensure that only rank 0
loads the grid.
- Updated the order in which Zoltan-parameters are set, to reduce the
amount of console-noise.
Made EQUELLE_DEBUG a proper CMake-option.

- Sub-CMakeLists.txt that already set this was updated.