deleted:    bin/buckets.py
- Buckets where moved to figaro.
modified:   src/plato/application.py
- Modified init_config() to set attachments_path and reports_path.

modified:   src/plato/schedule/__init__.py
- Folders ['pidfiles', 'attachments', 'reports'] are created by
  init_db()
- Changed the propagation order for init_db(). Now it is present at
  more levels (JobRunner, Scheduler, etc.) Those classes have own
  methods called from a higher level.

modified:   src/plato/schedule/local.py
- Refactored get_pidfile_path()

modified:   src/plato/shell/coreutils.py
- Added change_dir() with contextmanager implementation.

modified:   src/plato/shell/findutils.py
- Match.name can now be not only fnmatch pattern but also an regexp.