bug fixes

[jd-lara]

closes #271
closes #146

It also closes an issue with simulation reset that wasn't working correctly

[github-actions]

Performance Results

Version	Precompile Time
Master	10.666624873
This Branch	10.279763492

Version	Execute Time
Master-Build ResidualModel	14.122944492
Master-Execute ResidualModel	77.80324982
Master-Build MassMatrixModel	1.248934112
Master-Execute MassMatrixModel	103.762706818
This Branch-Build ResidualModel	14.098837712
This Branch-Execute ResidualModel	76.909383651
This Branch-Build MassMatrixModel	1.324593395
This Branch-Execute MassMatrixModel	102.952944907

ResidualModel and MassMatrixModel performance results should be compared between versions and not between models due to the execution order of the tests

[codecov]

Codecov Report

Merging #273 (b756ad3) into master (3eddbc3) will increase coverage by 0.63%.
The diff coverage is 68.42%.

@@            Coverage Diff             @@
##           master     #273      +/-   ##
==========================================
+ Coverage   89.96%   90.60%   +0.63%     
==========================================
  Files          65       64       -1     
  Lines        7113     7064      -49     
==========================================
+ Hits         6399     6400       +1     
+ Misses        714      664      -50     

Flag	Coverage Δ
unittests	90.60% <68.42%> (+0.63%)	⬆️

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

Impacted Files	Coverage Δ
src/base/definitions.jl	100.00% <ø> (ø)
src/base/simulation.jl	87.92% <62.50%> (-0.81%)	⬇️
src/base/jacobian.jl	95.77% <100.00%> (ø)
src/base/simulation_inputs.jl	93.10% <100.00%> (ø)
src/base/simulation_model.jl
src/base/frequency_reference.jl	88.23% <0.00%> (+0.73%)	⬆️
src/base/perturbations.jl	58.57% <0.00%> (+9.17%)	⬆️

[jd-lara]

The additional coverage is done in #274

[rodrigomha]

Looks good. We may want in the future add a test that reset the simulation by running the same execute two times.