[Users] Restriction fix

[Ian Hinder]

Hi,

Erik and I have found and fixed a bug in the way Carpet handles restriction and synchronisation.  Numerical results on coarse grids might change as a result of this.  Previously, the results would have dependent on the number of processes.

See https://trac.einsteintoolkit.org/ticket/1499 for more details.  Erik, should this be backported to the release branch at some point?

-- 
Ian Hinder
http://numrel.aei.mpg.de/people/hinder

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