[Carpet] expensive logging of CarpetRegrid[2] parameter changes

[Ulrich Sperhake]

> I agree with Bela - we use the CarpetRegrid::coordinates parameter to
> determine the grid structure throughout the run.  I believe Uli also
> uses this.  This works fine for us - please don't remove the
> functionality!

Just for confirmation: I do use the CarpetRegrid::coordinates throughout 
the run. It is always steerable, though I am not 100% certain I locally 
modified that or not.

Cheers,

Uli

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Ulrich Sperhake                        Tel.  : ++49 3641 947146
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