Refactor the globalload module.•••- Require that a non-empty last parameter is given to the commands.
- Use WriteRemoteNumeric instead of WriteNumeric so opers actually see the response.
- Store <security:allowcoreunload> instead of looking it up every time.
Improve the robustness of the DNSBL module.•••- Handle DNSBLs that return invalid lookup results.
- Fix DNSBLs that return non-local addresses blocking connections.
- Fix silently failing when a DNSBL returns no IPv4 results.
- General code cleanup.