[Carpet] Checking proper nesting

[Erik Schnetter]

I have just pushed a patch that makes Carpet check that the grid  
hierarchy is properly nested.  Proper nesting is a three-level  
relationship; it means (approximately) that grid points that are  
prolongated from level L-1 to level L are not themselves used to  
prolongate from level L to level L+1.  An additional parameter  
CarpetLib::proper_nesting_distance requires that there are  
additionally a few grid points separating these two regions.

If a grid structure is not properly nested, Carpet emits a level one  
warning during regridding.

-erik

-- 
Erik Schnetter <schnetter at cct.lsu.edu>

My email is as private as my paper mail.  I therefore support encrypting
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