Explicitly state the number of MC parent particles in `parent(int i)` functions

Andrii Verbytskyirequested to merge
averbyts/athena:explicit_particle_numbers_in_trigger into main

Explicitly state the number of MC parent particles in parent(int i) functions.

As of now the parent() function has a default argument 0. It would be nice to change it and remove the default argument, as it leadfs to bugs in some cases. This is a preparatory MR to implement the change in Trigger. It is expected it will not have influence on anything.

@jchapman @sutt

Edited by Andrii Verbytskyi

Merge request reports