Example accesses protected element

[casella]

@mtiller, this report suggests that model ModelicaByExample.Components.LotkaVolterra.Examples.ThreeSpecies_Quiescent in your library actually tries to access protected elements. We introduced stricter checks in OpenModelica since 1.19.0, so this model stopped running there.

Please consider making that element public.

[fubari]

The example ModelicaByExample.Components.LotkaVolterra.Examples.ThreeSpecies_Quiescent seems not to be working correctly for me, only finding the trivial solution due to not initializing the start value correctly.

PR #471 suggests adjusting the start value of population to a parameter variable (initial_population) instead of 10. With this change, all examples seem to work for me.