Fix events for DEA models

[FFroehlich]

Will add unittests.

Should probably add documentation that we assume events to be "impulse free" in a DAE context.

[codecov]

Codecov Report

Merging #687 into develop will increase coverage by 0.67%.
The diff coverage is 50%.

@@             Coverage Diff             @@
##           develop     #687      +/-   ##
===========================================
+ Coverage    72.77%   73.44%   +0.67%     
===========================================
  Files           49       49              
  Lines         7152     7171      +19     
===========================================
+ Hits          5205     5267      +62     
+ Misses        1947     1904      -43

Flag	Coverage Δ
#cpp	70.07% <50%> (+0.92%)	⬆️
#python	83.68% <ø> (-0.06%)	⬇️

Impacted Files	Coverage Δ
src/forwardproblem.cpp	87.5% <ø> (-0.04%)	⬇️
src/solver_idas.cpp	44.36% <50%> (+9.9%)	⬆️
python/amici/__init__.py	83.63% <0%> (-1.82%)	⬇️
src/model_dae.cpp	51.85% <0%> (+10.37%)	⬆️

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[dweindl]

Added on purpose? BIN +12.6 KB (100%) tests/cpputest/testOptions.h5