fix!: do not shift longitude values

[aaron-hopkinson]

Description

The ECMWF ODB source returns longitudes on the [-180,180] range, which is different from e.g. the MARS ERA5 data, where it is [0, 360] – this meant that the superob code wrapped the longitudes to deal with this data. A better solution would be to keep not change the range within filters, and either adapt sources so they output data with consistent longitude ranges, or make them consistent only when combining datasets.

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[neill-b]

To get this to work as intended, I also needed to adjust the grid specification in irregular_to_grid. In _define_grid the line changing the longitudes should become:
lon = np.where(grid_info["longitudes"] < 0, grid_info["longitudes"] + 360, grid_info["longitudes"])
As the previous line reset the longitudes to the range [180, 180).