Default SQLite quoting to off until we are capable of disabling it everywhere

Default SQLite quoting to off until we are capable of disabling it everywhere

Currently the diffing routines are either "always on" or "always off" with
no ability to pass around a setting (they are all class methods, never
looking at the $translator object). Until we can allow a user to say
quote_identifiers => 0, and not have to change any of the old tests, it
makes little sense to change the default.