Core/maps: Update DevScan.total() for the new (R55) structures.

Signed-off-by: Martin Stone <martin@d7415.co.uk>
(cherry picked from commit 0963a11fc0f940a295920cc358dc1d01fa1bac89)
(cherry picked from commit 04d8ee15436f2244d2ce5fc4efff064bceaea890)
createdb: Dump file archiver needs to check for round as well as noschema.

Signed-off-by: Martin Stone <martin@d7415.co.uk>