Fixes for ERAD 2022 short course

[pulkkins]

This pull request is for fixes to issues that were found before or during the ERAD 2022 short course. Currently these fixes include:

• Option to use different window sizes in the x- and y-directions in utils.dimension.aggregate_fields_space.
• DARTS: raise error when the inputs contain non-finite values

[codecov[bot]]

Codecov Report

Merging #293 (5084f89) into master (33d80d4) will increase coverage by 0.01%. The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master     #293      +/-   ##
==========================================
+ Coverage   82.70%   82.71%   +0.01%     
==========================================
  Files         160      160              
  Lines       12273    12292      +19     
==========================================
+ Hits        10150    10167      +17     
- Misses       2123     2125       +2     

Flag	Coverage Δ
unit_tests	82.71% <83.33%> (+0.01%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pysteps/extrapolation/semilagrangian.py	70.10% <ø> (ø)
pysteps/tests/test_utils_dimension.py	100.00% <ø> (ø)
pysteps/verification/plots.py	11.11% <0.00%> (ø)
pysteps/motion/darts.py	79.62% <50.00%> (-0.56%)	:arrow_down:
pysteps/utils/dimension.py	82.40% <100.00%> (+0.28%)	:arrow_up:
pysteps/downscaling/rainfarm.py	100.00% <0.00%> (ø)
pysteps/tests/test_plt_precipfields.py	91.17% <0.00%> (ø)
pysteps/tests/test_downscaling_rainfarm.py	100.00% <0.00%> (ø)
pysteps/visualization/precipfields.py	84.05% <0.00%> (+0.21%)	:arrow_up:

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