fixes issue #140 to add support for spatial forecasts

[wsavran]

also fixes import issues with spatial poisson likelihood function

[wsavran]

@khawajasim do you mind taking a look at this and seeing if it solves your problem

[codecov-commenter]

Codecov Report

Merging #142 (f42a502) into master (7686eda) will increase coverage by 0.05%.
The diff coverage is 83.33%.

❗ Current head f42a502 differs from pull request most recent head 5d93510. Consider uploading reports for the commit 5d93510 to get more accurate results

@@            Coverage Diff             @@
##           master     #142      +/-   ##
==========================================
+ Coverage   56.88%   56.94%   +0.05%     
==========================================
  Files          19       19              
  Lines        3157     3161       +4     
  Branches      457      458       +1     
==========================================
+ Hits         1796     1800       +4     
  Misses       1250     1250              
  Partials      111      111              

Impacted Files	Coverage Δ
csep/core/poisson_evaluations.py	42.72% <50.00%> (+0.26%)	⬆️
csep/utils/calc.py	54.78% <100.00%> (+1.21%)	⬆️

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[khawajasim]

Hi. Thanks for the fix. This looks good and should work.

Kind Reagrds