parametrize number of events per job

[cranmer]

The number of events per generation job is set in the run cards:
https://github.com/scailfin/madminer-workflow-ph/blob/master/code/cards/run_card_signal.dat#L31

Changing this requires changing the docker comtainer. This should be exposed by both the physics workflow and the wrapper workflow.

[Sinclert]

@irinaespejo can you confirm that increasing the value of num_generation_jobs does not increase the number of total events? just splits the same number by more processes?

[irinaespejo]

Hi @Sinclert I've found out more about what happens when changing "num_generation_jobs". See issue #43 . Thanks!

[Sinclert]

Please see issue madminer-tool/madminer#454, where I propose a discussion of whether what this issue describes should or should not be moved to the library itself.