* make dimension.py xarray compatible

* convert final method in the dimension module

* nanmin in stead of zerovalue in square domain method

* make test steps skill run

* undo accidental change

* remove commented out code

* The dataset can contain more than one dataarray

* Address pull request comments

* Add links to dataset documentation everywhere

* make test steps skill run

* undo accidental change

* make steps nowcast xarray compatible

* wrap all nowcasts in xarray

* fix dimension.py tests

* update dimension.py to work with new dataarrays

* fix test_nowcast_utils tests

* update docs and make xarray usage more explicit in nowcasts

* update docs and make xarray usage in motion methods more explicit

… and found some first declartions in the code that where not in the init

…recast runs in a row

Co-authored-by: mats-knmi <[email protected]>

Co-authored-by: mats-knmi <[email protected]>

….velocity_perturbations = [] in __initialize_random_generators

…to come later

…xed seed assingments

* Use seed for all rng to make a test run completely deterministic

* fix probmatching test and some copy paste oversights

* Add test for vel_pert_method

* Change the test so that it actually runs the lines that need to be covered

…workers at the same time

… into xarray/main

…as the master

… into xarray/main