Usage
    readDigestFile(opts, endpoint = "mc-all/grid/digest.txt")
 
    
    Arguments
- opts
- simulation options 
- endpoint
- Suffix of path for digest file
Default is : "mc-all/grid/digest.txt" added to opts$simDataPath 
 
    
    Value
    list of 5 tables (begin, areas, middle, links lin., links quad.)