Simplification of PEtab problems

[dweindl]

Adds some functions to simplify / clean existing PEtab problems:

• removing unused conditions
• moving parameters that aren't really condition-dependent from the conditions table to the parameters table

[codecov-commenter]

Codecov Report

Merging #172 (b8e7ce7) into develop (b6f234e) will increase coverage by 0.93%. The diff coverage is 62.50%.

@@             Coverage Diff             @@
##           develop     #172      +/-   ##
===========================================
+ Coverage    77.50%   78.44%   +0.93%     
===========================================
  Files           29       30       +1     
  Lines         2601     2649      +48     
  Branches       594      606      +12     
===========================================
+ Hits          2016     2078      +62     
+ Misses         430      411      -19     
- Partials       155      160       +5     

Impacted Files	Coverage Δ
petab/simplify.py	62.50% <62.50%> (ø)
petab/models/sbml_model.py	96.36% <0.00%> (+1.81%)	:arrow_up:
petab/sbml.py	68.14% <0.00%> (+2.65%)	:arrow_up:
petab/lint.py	75.37% <0.00%> (+8.40%)	:arrow_up:

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