Ouranosinc / xclim / 7062839811

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fix freq/offset/indexer attrs in SPI (#1538)

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### Pull Request Checklist:
- [x] This PR addresses an already opened issue (for bug fixes /
features)
    - This PR fixes #xyz
- [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?

* Fixes wrong attributes in SPI/SPEI functions, allow to save files in
netcdf files.

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

### Other information:

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8559 of 9463 relevant lines covered (90.45%)

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