Update data_key by processing the tracking document and renaming/adding files to data_key.
1 2  | 
path | 
 Path to AFS root directory (getOption('afs.path))  | 
tracker | 
 tracking file (getOption('afs.tracker'))  | 
data | 
 Data key (getOption('afs.key')  | 
save_key | 
 Save the returned key (default to "pkg/extdata/data_key.rda")  | 
outfile | 
 Where to save key, only used if save_key is TRUE.  | 
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