Revise Deduplication Algorithms

02e: change directories
03: code to extract dateparts is unnecessary
06: match based on set101 and main02, and match new records to new
records and old records (so that old records don't need to match to old
again)
07: revise linkage code so that lowest id in link_id groupings is used
as the link_id, revise race_ethnicity algorithm, create common city and
common lhj variables, rename resolved variables to have the 'best_'
prefix
08: create only two final datasets main01 and main02
99: save code that revised link_id in old registry so that lowest id in
link_id group is the value of the link_id (does not need to be run
again)