fluidsimulation2d: stupid me messed up a rebase.
fluidsimulation2d: stupid me messed up a rebase.

Accidentally gone from c319e0122c94b3ddb50616a4761f01a7862327cb.

mosra/magnum-examples,mosra/magnum-examples,mosra/magnum-examples,mosra/magnum-examples,mosra/magnum-examples,mosra/magnum-examples,mosra/magnum-examples