Add back a method for getting all (some) of the rows for debugging and tests
Split Open out into OpenDB and NewDB

We used to have this distinction and I think it's useful to add back in.
Update server to match gumshoe changes
[server] Better status codes
Accept rows without metric columns (insert 0s automatically)
Flesh out the serialization test
Shut down all request goroutines when rotating State
Export MakeRequest
[server] Add the metricz back in.

Now new and improved!
[server] Stop logging every flush