logging uses unique file names that lock and don't allow simultaneous use in separate chores

example is download_cdec. Besides previous comments on multithread/core, two prompts can't use it because logger_datastore.log gets locked. Think we halfway fixed this. Anyhow this is one criterion of success. We might consider logging for individual download_X being off unless we are debugging as well.  Seems we agree reformat is too silent and populate too chatty.