Fix parsing of messages that contain empty newlines in sections
Add partial offline mode

Uses recorded data if available on disk, otherwise the network is
queried.
Add unit test for validation of NODATA

- When the closest enclose wildcard is missing from the response
- That the response was synthesized from the correct wildcard
Add unit test to check for correct wildcard synthesis (NSEC3)
Remove unused parameter
Add unit tests to check faked NODATA responses (NSEC3)