Fix for bug displaying old schedule

Partially undid checkin:
commit 28d76619e8c93a0b33c029d7cc0030b1f8fd7c61
Author: Greg @ MBA <greg@grogo.org>
Date:   Mon Aug 12 19:43:42 2013 -0700

    Fixed rad visibility status

    don't display invisible rads like *NOBODY* on the main schedule.  But show all rads in radmanage.py

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That's because when looking at old schedules, people who left and are marked invisible weren't showing up on the schedule, making it look incorrect.