[Developers] New option "out_dt" for outputting variables

[Thomas Radke]

Erik Schnetter wrote:
> Hi Thomas,
> 
> adding a new field to the ioRequest structure and updating the IOUtil  
> APIs as described above requires the corresponding changes to all I/O  
> thorns.  I have implemented them locally and they are  straightforward.  
> Do you agree that I should commit these changes?

Yes, please do so.
I guess if something fundamental breaks we will see it immediately in 
the integration nightly test results in the portal 
https://portal.cactuscode.org.

-- 
Cheers, Thomas.