This commit removes support for a standalone "L" in the day-of-week of a cron expression, which used a locale-dependent API to determine what the last day of the week is (Saturday or Sunday ?). Alternatively, we could have implement this in the exact way as Quartz has done (i.e. treat the "L" like "SAT"), but we opted not to do that, as having an explicit SAT or SUN is much clearer.