CVS info   : $Header:$

Cactus Code Thorn WaveToyExpl
Thorn Author(s)     : Erik Schnetter <schnetter@uni-tuebingen.de>
Thorn Maintainer(s) : Erik Schnetter <schnetter@uni-tuebingen.de>
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Purpose of the thorn:

Integrate the scalar wave equation with a multi-step integrator, but
preserving the intermediate steps to allow fine grid boundary
prolongation on them.