Commits on Apr 21, 2022

1. Propose resolution _groups_ for xarray support (see ome#48) …

   In discussing with the xarray community, the one change to the NGFF
   specification that needs to occur to prevent errors being raised
   when opening a multiscale is for each resolution _array_ to live
   in a separate _group_. This has already been tested by thewtex
   in https://github.com/spatial-image/spatial-image-multiscale and
   the current spec is permissive enough to allow it. The proposal
   here would enforce the subdirectories moving forward.
   
   The conflict in xarray stems from the fact that each of our
   subresolutions have the same dimension names ("x", "y,", etc.)
   but different sizes. This is not allowed in the xarray (nor NetCDF)
   model. An added benefit of this change is that other arrays with
   the same resolution levels and the same dimensions (e.g. labels!)
   could be stored together:
   
   ```
       ├── resolution-N/.zgroup
       │   ├── image/.zarray
       │   └── labe/.zarray
   ```

   

   joshmoore committed Apr 21, 2022
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