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Follow-ups on MultIndex support #719

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@shoyer

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@shoyer

xref #702

  • Serialization to NetCDF
  • Better repr, showing level names/dtypes?
  • Indexing a scalar at a particular level should drop that level from the MultiIndex (MultiIndex and data selection #767)
  • Make levels accessible as coordinate variables (e.g., ds['time'] can pull out the 'time' level of a multi-index)
  • Support indexing with levels, e.g., ds.sel(time='2000-01').
  • Make isel_points/sel_points return objects with a MultiIndex? (probably after the previous TODO, so we can preserve basic backwards compatibility) (differed until we figure out Indexing with alignment and broadcasting #974)
  • Add set_index/reset_index/swaplevel to make it easier to create and manipulate multi-indexes

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