Ouranosinc / figanos / 18509459827

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Make get_var_group usable outside (#365)

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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).
- [ ] (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?

* I made the json file location default in order to be able to call
`get_var_group` easily externally.

### Does this PR introduce a breaking change?
no

### Other information:

2 of 4 new or added lines in 1 file covered. (50.0%)

158 of 1930 relevant lines covered (8.19%)

0.41 hits per line