Ouranosinc / xsdba / 13576717294

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MBCn with 5days-OddWindow (#79)

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### Pull Request Checklist:
- [ ] This PR addresses an already opened issue (for bug fixes /
features)
  - This PR fixes #xyz
- [x] (If applicable) Documentation has been added / updated (for bug
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### What kind of change does this PR introduce?

* Small workaround to be able to use the 5 day grouping in MBCn,
compatible with odd windows.

### Does this PR introduce a breaking change?

No

### Other information:

This doesn't respect the logic of `Grouper`, but to activate this
functionality, I pass a `Grouper("5D", window=7)`. I think only time,
time.season, time.month, time.dayofyear would be allowed as strings in a
proper implementation ("The usual grouping name as xarray understands
it. Ex: "time.month" or "time".") To allow more complex group, I guess
we would need to accept Pandas object or something.

Since MBCn doesn't currently use map_groups, implementing this hack was
relatively easy.

This is also thought specifically for a 365-day calendar, that 5 is a
factor of 365 (5*73).

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