Add options to slow down local crawler

These options are meant to make the local crawler behave more like a
network-based crawler for purposes of testing and debugging other parts of the
code base.

PFERD/conductor.py

@@ -17,6 +17,7 @@ class ProgressBar:
 
     def set_total(self, total: float) -> None:
         self._progress.update(self._taskid, total=total)
+        self._progress.start_task(self._taskid)
 
 
 class TerminalConductor: