0.2.0

Interface changes and new features:

• option to run external Pythia cards rather than those generated by svjHelper. run_model now takes a subcommand, either helper or external.
• a new step hist can automatically generate some histograms.
• improve constituent storage in Delphes and add dark hadron jets

Also some bug fixes in Snowmass models.

0.1.0

First (relatively) complete version. Physical/theoretical correctness not guaranteed.