registered SWE git submodule
added assertions
Merge branch 'successive_grid_generation' of atsccs69.informatik.tu-muenchen.de:/work/wittmanr/peanoclaw into successive_grid_generation
Merge branch 'successive_grid_generation' of github.com:unterweg/peanoclaw into successive_grid_generation
Merge 131.159.37.24:~/Dissertation/Peano/peanoclaw into successive_grid_generation