some editing for read_in to avoind -1 antennae -- we still, however, end
up with users who have home 0 if thier work is known, and it seems for
all the users we know at leats work or home.
however, now i can only save the users for whom we know home for sure
and have correct stats.
added also work stats calculating in case we need it (users work and
number of commuters to that place)
* one idea here -- perhaps checking percent of people who work somewhere
vs those who commute in