Ouranosinc / xsdba / 34973019099

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fix circular bias (#308)

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

* Fix `circular_bias` which was sometimes giving the wrong sign.

### Does this PR introduce a breaking change?
Yes, values can be different, but they were wrong previously. 

### Other information:

4 of 4 new or added lines in 3 files covered. (100.0%)

2914 of 3687 relevant lines covered (79.03%)

8.48 hits per line