Add upsert --warn-no-triage flag for warning when applicants do not
have reviewers assigned in the incoming CSV file. This is not always
the case, so we can't make the field mandatory.
I'd forgotten about this repository! Oops! Anyway, it's here
and it's checked in now. Much of the work done here is in
preparation for subcommands which consume entries in the server
in addition to populating them.
In the process, we've moved from 'wreq' to 'req', a more-modern
web framework (or at least, one with more active development)