johannbrehmer/madminer: v0.2.5

Documentation: New systematics example. Bug fixes: Fixed multiple issues in the parsing and editing of run cards for systematics. Fixed photons and gluons being swapped in LHEProcessor observables. Fixed crash when no events survive LHEProcessor cuts. Fixed extract_samples_test() crashing in the presence of nuisance parameters. Fixed the pythia_card.dat in the Delphes tutorial that lead to hangups of unpatched Pythia version. Internal changes: Improved warnings and logging output in various places