1, move inputs/outputs from steps into sessions. 2, within sessions, steps -> step_ids
1, move inputs/outputs from steps into sessions. 2, within sessions, steps -> step_ids

StanfordBioinformatics/xppf,StanfordBioinformatics/loom,StanfordBioinformatics/xppf,StanfordBioinformatics/xppf,StanfordBioinformatics/loom,StanfordBioinformatics/loom,StanfordBioinformatics/xppf,StanfordBioinformatics/loom