Communicative workflow reader

Created by: stefanoborini

Makes the workflow reader more robust and more communicative of what went wrong during reading.

Created by: codecov[bot]

Codecov Report

Merging #137 into master will increase coverage by 0.01%. The diff coverage is 89.28%.

@@            Coverage Diff             @@
##           master     #137      +/-   ##
==========================================
+ Coverage   88.92%   88.93%   +0.01%     
==========================================
  Files          36       36              
  Lines         849      886      +37     
  Branches       60       60              
==========================================
+ Hits          755      788      +33     
- Misses         85       89       +4     
  Partials        9        9

Impacted Files	Coverage Δ
force_bdss/core_evaluation_driver.py	86.25% <0%> (-0.17%)
force_bdss/io/workflow_reader.py	96.72% <92.59%> (-3.28%)

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