Ouranosinc / xclim / 5350328860

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Hardiness zones (#1396)

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### Pull Request Checklist:
- [x] This PR addresses an already opened issue (for bug fixes /
features)
    - This PR addresses part of #1290 
- [x] Tests for the changes have been added (for bug fixes / features)
- [x] (If applicable) Documentation has been added / updated (for bug
fixes / features)
- [x] CHANGES.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?

* Adds the Hardiness Zones index with options for both Australian and
USDA classifications
* Adds separate indicators for each classification scheme.

### Does this PR introduce a breaking change?

No.

### Other information:

39 of 46 new or added lines in 3 files covered. (84.78%)

8091 of 8976 relevant lines covered (90.14%)

3.47 hits per line