data function, an environment 'db' is generated, which contains:
list of GatingSet objects
data.frame that records the 'gsid' and 'gsname' of each object within gs
data.table that stores the statistics pre-caluclated from gs
data.frame stores the outlier detection results
data.frame stores the group outlier detection results
qaCheckList is a example spreadsheet of the definitions of qaTaskstubesevents is an example spreadsheet of thresholds for total number of events based on each 'tube'