Option to disable event-handling

[dweindl]

During preequilibration and presimulation, amici only handles events at t=t0, the others are ignored. For debugging preequilibration failures, it would be convenient if one could switch off event handling also for regular simulations. The alternative would be re-importing the model without events, which is often inconvenient.

[dweindl]

For PEtab 2.0 we will require events to be processed during preequilibration. For PEtab 1.0, this wasn't explicitly specified, but there wasn't really a reason to assume that they should not be processed. Therefore, amici's non-event-handling could be considered a bug.
If we want to keep backward compatibility, we'll have to add such an option to enable/disable event processing.
However, I think, it would be less surprising, and thus, preferable to change the default. I am not sure how many users were aware of events not being processed during preequilibration.

[FFroehlich]

sounds fair