#238 duplication when adding people

[Kevin Field]

This is pretty insignificant, but I thought I'd report it
anyway. If you have a BeMail window open, then you open
People and add someone and flag that they're in a few
different groups, then save that person, but before closing
People you put them in one more group and then save again, in
BeMail that person is listed twice in each of the groups in
the first set, even 'All People'. It's fine after you open
another BeMail window.

Actually, I got slightly different behaviour the second time I
tried this.

First time, added someone to 3 groups; showed up in all three
and 'All People' once each and didn't show up outside the
groups; after adding to a fourth group and resaving, showed up
in each of the original 3 and 'All People' twice and in the
new group once.

Second time, added someone to 1 group; showed up only outside
the groups (like, up one level from 'All People' rather than
inside it); added to a second group, showed up outside groups,
once in 'All People' and the first group, but not in the
second group; added to a third group, showed up outside
groups, twice in 'All People' and the first group, once in the
second group, but not in the third group; same pattern for the
fourth group I tried--it was always one copy behind compared
with the first example.

Kev