FS#222 tests schould use the parameters from the input file
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Description
Currently, many tests overwrite the parameters given in the input files.
This is bad for two reasons:
- first, it leads to errors, as many people assume that the input file is used.
- second, theses parameters were given for a reason. Mostly the overwriting is done in order to have faster execution and the parameters are specified in order to test the modeled physics. We need to get to a decision, or at least clarity, in this respect.