[ET Trac] [Einstein Toolkit] #442: Restructure grid hierarchy properties

[Einstein Toolkit]

#442: Restructure grid hierarchy properties
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 Reporter:  eschnett     |       Owner:  eschnett
     Type:  enhancement  |      Status:  new     
 Priority:  minor        |   Milestone:          
Component:  Carpet       |     Version:          
 Keywords:               |  
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 Some time ago, someone (can't find the email right now) reported problems
 with CarpetRegrid2, where the grid structure may be inconsistent. I have
 restructured the code, but since this is a fairly invasive change I would
 like this to be thoroughly tested before committing it.

 This change may lead to Carpet using a (slightly) different grid structure
 than before. The differences are not "important"; what potentially changes
 is the order in which consistency conditions are applied. I expect that,
 in most cases, there will be no differences. The list of consistency
 conditions is:

 - ensure proper nesting (level must be larger than next finer level)
 - add buffer zones (only once, not really a consistency condition)
 - combine regions into a single box (if this is efficient)
 - apply rotating 90/180 symmetry (if requested)
 - clip at outer boundary (so that boxes that are too large or are outside
 are cut off)

 I attach a patch and four new files that implement this restructuring.
 Give it a try if you are interested.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/442>
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