dmwm/T0 — pull request #3968 by hufnagel (2012-09-12 12:39:35+00:00)
Title: make the LFN prefix a run config setting

The LFN prefix is at the moment picked up from the configuration whenever we configure for run/stream or run/dataset. Change this to make it a run configuration parameter that stays the same
for all workflow in a run.