Ouranosinc / xclim / 13157163594

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Correctly interpolate seasons in Grouper (#2019)

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### Pull Request Checklist:
- [x] This PR addresses an already opened issue (for bug fixes /
features)
    - This PR fixes only part of #2014 
- [x] Tests for the changes have been added (for bug fixes / features)
- [x] CHANGELOG.rst has been updated (with summary of main changes)
- [x] Link to issue (:issue:`number`) and pull request (:pull:`number`)
has been added

### What kind of change does this PR introduce?

This PR adds a line to correctly interpolate seasonal values. It also
changes the test_timeseries function that now accepts a `calendar`
argument instead of `cftime`. Not providing it or providing `None` is
equivalent to `cftime=False` and `calendar='standard` to the previous
`cftime=True`. This allows for testing different calendar
implementations e.g. 360_day calendars

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