[ET Trac] [Einstein Toolkit] #1428: remove some Carpet build warnings, add run-time warnings about grid structure dataset

[Einstein Toolkit]

#1428: remove some Carpet build warnings, add run-time warnings about grid
structure dataset
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  Reporter:  rhaas   |       Owner:  eschnett           
      Type:  defect  |      Status:  reviewed_ok        
  Priority:  minor   |   Milestone:                     
 Component:  Carpet  |     Version:  development version
Resolution:          |    Keywords:                     
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Changes (by eschnett):

  * status:  review => reviewed_ok


Comment:

 0001: approved
 0002: seems right-ish
 0003: looks good, if this warnings handles only the filereader case.
 Obviously, reading a checkpoint file without grid structure needs to
 abort.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1428#comment:2>
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