relax SVN archive

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r23240 | tlinnet | 2014-05-19 14:44:12 +0200 (Mon, 19 May 2014) | 10 lines

Math-domain catching for model CR72.

task #7793: (https://gna.org/task/?7793) Speed-up of dispersion models.

This is to implement catching of math domain errors, before they occur.
These can be found via the --numpy-raise function to the systemtests.

To make the code look clean, the class object "back_calc" is no longer
being updated per time point, but is updated in the relax_disp target function in
one go.
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