Replace the try/finally { connection.Close(); } pattern used across
most of DataAccess.cs with using declarations, so disposal happens
automatically and can't be skipped by a future edit that adds an
early return before the finally. Left the shared-connection
(ownsConnection) call sites alone since those intentionally outlive
a single method call.
Also drop a stray unused `using static ... JSType` import, and make
a missing ContainsList config setting fail with a clear
InvalidOperationException instead of a NullReferenceException from
Split(',') on null.
jim
f549f020e1