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[diffusion test] test a nonrandom initial condition

Kai Wendel requested to merge check-on-a-defined-initial-condition into feature/simple-diffusion

!closes #1219

It seems, that we should think about, if it is a problem of the initial condition, so because of the use of multiple processes, the random numbers applied vary on the domain. Then it would not be a bug of the solver or a problem with overlap at all. If one changes the term in the main file in line 174 to:

    sol[n] = double(n%2)/10.0;

then the initial conditions are the same. This is totally different for a value of 7 instead of 2. We should find a way, that ensures that initial conditions are the same no matter if mpi is used or not, maybe via a loadsolution.

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