Allow import of CSV data dumps from ScoutNet to build troop rosters

[justdave]

It'd be mighty convenient to be able to import a troop from ScoutNet in order to build their roster and have it pre-populated with data that can be used to build the ballot for a troop (and have all the correct data for import into OALM).

I have an example file in my possession but I won't upload it because it has lots of personal data in it of course. I can probably list the field names and try to describe their contents (if I can decipher them all). At least for the fields we'll care about. Eventually.