BibAuthorID: CLI option for modified records

• Now the CLI options --personid-gc and --fast-update-personid can both be used in three ways:
  
  bibauthorid --cmd : runs only on new and modified papers since last run bibauthorid --cmd -r 1,5,7 : runs only on specified records bibauthorid --cmd --all-records : runs on all records
  
  Suggested routine operation for BAI is to run, in this order
  
  bibauthorid --fast-update-personid bibauthorid --personid-gc
  
  once a day, and
  
  bibauthorid --fast-update-personid --all-records bibauthorid --personid-gc --all-records
  
  once ever one/two weeks.