[ET Trac] [Einstein Toolkit] #2047: support mesh refined grid scalars and grid arrays

[Einstein Toolkit]

#2047: support mesh refined grid scalars and grid arrays
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 Reporter:  rhaas        |       Owner:  eschnett           
     Type:  enhancement  |      Status:  new                
 Priority:  minor        |   Milestone:                     
Component:  Carpet       |     Version:  development version
 Keywords:               |  
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 Every once in a while it would be useful if one had access to scalar/array
 variables for which there was one copy per refinement level and that may
 or may not restrict from the fine into the coarse levels.

 Examples are
 * evolving particles along with the fields (restriction would happen) if
 there is actual back-and-forth interaction between particles and fields
 (ie not just tracers)
 * keeping track of a reduced quantity on a per-reflevel basis (eg. number
 of times RHS was evaluated for this level), not restriction in this case

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/2047>
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