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Tech edit schedule subset option

Add an option for tech edits with limited editing capabilities, such as editing the schedule and vacation status.  There may be other variations, but this could be useful in cases where tech schedules can change often, and it can be given to either the tech supervisor or the tech themselves, but keep them from having the entire tech edit set.  Having the ability to set vacation for the tech themselves may not resolve all cases of needing to alter a schedule.