Introduced ExecutionLayer object to simplify notification handling

Created by: stefanoborini

Introduces the ExecutionLayer object in the model to simplify handling at the UI level

Created by: codecov[bot]

Codecov Report

Merging #122 into master will increase coverage by 0.04%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #122      +/-   ##
==========================================
+ Coverage   93.42%   93.47%   +0.04%     
==========================================
  Files          35       36       +1     
  Lines         715      720       +5     
  Branches       58       58              
==========================================
+ Hits          668      673       +5     
  Misses         40       40              
  Partials        7        7

Impacted Files	Coverage Δ
force_bdss/io/workflow_reader.py	100% <100%> (ø)
force_bdss/core_mco_driver.py	91.04% <100%> (ø)
force_bdss/core/execution_layer.py	100% <100%> (ø)
force_bdss/core/workflow.py	100% <100%> (ø)
force_bdss/core_evaluation_driver.py	86.58% <100%> (ø)
force_bdss/io/workflow_writer.py	88.88% <100%> (ø)

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