Cfgrib

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- Enable ecCodes implicit MULTI-FIELD support by default, needed for NAM Products by NCEP.
See: `45 <https://github.com/ecmwf/cfgrib/issues/45>`_.
- Added support for ``depthBelowLand`` coordinate.

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- Add support for building ``valid_time`` from a bad ``time-step`` hypercube.

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- Also convert is ``valid_time`` can index all times and steps in ``translate_coords``.

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- Set ``valid_time`` as preferred time dimension for the CDS data model.
- Fall back to using the generic ``GRIB2`` *ecCodes* template when no better option is found.
See: `39 <https://github.com/ecmwf/cfgrib/issues/39>`_.

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- Fix the crash when using ``cf2cdm.translate_coords`` on datasets with non-dimension coordinates.
See: `41 <https://github.com/ecmwf/cfgrib/issues/41>`_.
- Added a ``cfgrib`` script that can translate GRIB to netCDF.
See: `40 <https://github.com/ecmwf/cfgrib/issues/40>`_.

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- Drop support for *xarray* versions prior to *v0.11* to reduce complexity.
(This is really only v0.10.9).
See: `32 <https://github.com/ecmwf/cfgrib/issues/32>`_.
- Declare the data as ``CF-1.7`` compliant via the ``Conventions`` global attribute.
See: `36 <https://github.com/ecmwf/cfgrib/issues/36>`_.
- Tested larger-than-memory and distributed processing via *dask* and *dask.distributed*.
See: `33 <https://github.com/ecmwf/cfgrib/issues/33>`_.
- Promote write support via ``cfgrib.to_grib`` to **Alpha**.
See: `18 <https://github.com/ecmwf/cfgrib/issues/18>`_.
- Provide the ``cf2cdm.translate_coords`` utility function to translate the coordinates
between CF-compliant data models, defined by ``out_name``, ``units`` and ``store_direction``.
See: `24 <https://github.com/ecmwf/cfgrib/issues/24>`_.
- Provide ``cfgrib.__version__``.
See: `31 <https://github.com/ecmwf/cfgrib/issues/31>`_.
- Raise with a better error message when users attempt to open a file that is not a GRIB.
See: `34 <https://github.com/ecmwf/cfgrib/issues/34>`_.
- Make 2D grids for ``rotated_ll`` and ``rotated_gg`` ``gridType``'s.
See: `35 <https://github.com/ecmwf/cfgrib/issues/35>`_.