Ouranosinc / xclim / 9782292169

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Fix for Fahrenheit deltas, degree-days and others. (#1804)

### What kind of change does this PR introduce?

* New function `ensure_absolute_temperature` that converts temperature
units to their absolute counterpart _assuming_ they represented a delta.
So °C becomes K and °F becomes °R. Anything else goes unmodified
(including compound units like `°C m` (whatever that means)).
* Use this function in `to_agg_units` to ensure a correct output for
`op` "std", "var" and "integral".

### Does this PR introduce a breaking change?

No.

### Other information:

Pint has "delta_degC" and "delta_degF" for temperature differences, but
CF does not. So this new function helps in the specific case where we
know the data is delta-like, which happens for the given `op`.

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