[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:  new                
 Priority:  minor   |   Milestone:                     
Component:  Carpet  |     Version:  development version
 Keywords:          |  
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 the attached patch adds a level 2 warning when CarpetIOHDF5 cannot read
 the grid structure attribute (actually a dataset but treated as an
 attribute) in hdf5 files. This can happen if very old files (pre grid
 structure version 5) are being read or files that do not have the
 attribute at all. The attribute is used by the checkpoint recovery routine
 to reconstruct the process decomposition, but (as far as I know) ignored
 by the file reader for ID.

 There is also one bugfix in 0002 that makes it possible to read multipatch
 data into a cartesian simulation as ID by using only the cartesian patch.
 While the patch is fairly simple please comment on whether it is fine to
 move the calculation of upper/lower into the loop over local maps, given
 that the upper/lower values are those of the patch to be read from file.
 The reason for the move is that the calculation needs the stride which is
 read from the current simulation and not from the patch (and can only be
 gotten if the map in question actually exists).

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