[Developers] New option "out_dt" for outputting variables

[Erik Schnetter]

It would be convenient to be able to select the output interval of  
individual variables not only by iteration number but also by  
simulation time.  I suggest to allow the syntax

	ADMBase::metric{out_dt=2.0}

in addition to the already possible

	ADMBase::metric{out_every=1024}

in the variable list specifications which determine which variables  
are output in parameter files.

This would include adding a new structure field out_dt to the  
ioRequest structure and updating the signatures of the CactusBase/ 
IOUtil functions IOUtil_ParseVarsForOutput,  
IOUtil_ParseOutputFrequency, and IOUtil_DefaultIORequest to accept an  
additional argument for out_dt.

-erik

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

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