[Developers] Making WaveToy use InitBase

[Erik Schnetter]

The IDScalarWave thorns currently initialise exactly two time levels.   
This is inconvenient for mesh refinement: If three time levels are  
needed, then Carpet has to perform an additional initialisation step  
and cannot rely on the analytic solution for initial data.   
Furthermore, if this is not done, the third time level remains  
uninitialised, leading to problems that are very difficult to detect,  
since people typically don't output past time levels.

I suggest to make IDScalarWave use the InitBase infrastructure to  
detect this problem.  In particular, if InitBase specifies that only a  
single time level is to be initialised, IDScalarWave should do so, and  
if all time levels should be initialised, IDScalarWave should either  
also do so, or abort with an error message during parameter checking.

-erik

-- 
Erik Schnetter <schnetter at cct.lsu.edu>   http://www.cct.lsu.edu/~eschnett/

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