Ibicus interface, xclim computation

[aulemahal]

This branch is an experiment of building an Ibicus interface to debiasing methods, but using xclim code for the computation. It is also a place where we can takes notes of the major (and minor!) caveats that make integrating xclim into ibicus difficult.

We could another such PR on xclim to test the opposite (a xclim interface using ibicus code for computation).

Caveats

• No xarray. Xclim mid-level adjustment function expect xarray objects. Rebuilding DataArrays from numpy arrays (that I had opened with xarray) feels weird, but it works.

[FussyDuck]

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[aulemahal]

Woops, I meant to open that PR on the Ouranosinc fork, as so not to pollute this repo too much. Well, too late, I'll keep it here. I've just begun my exploration.