BibWorkflow: API changes
- Changes BibWorkflow API functions from run() to start() and changes all sample tasks and workflows to accomodate this change, by Jan Aage Lavik.
- Renames workflow and object logging models and removes legacy or unused logging models.
- Several PEP8 and cosmetic updates.
Co-authored-by: Jan Aage Lavik <jan.age.lavik@cern.ch>