- Add SPF support
- Added rotation of name servers - SF Patch ID: 2795929.
- Address sourceforge patch requests 2981978, 2795932 to add revlookupall
and raise DNSError instead of IndexError on server fail.
- Use blocking IO with timeout for TCP replies.
- Don't try to close socket when never opened.
- Clarify CNRI (academic-style) license.
PR: ports/156029
Submited by: Ruslan Mahmatkhanov <cvs-src@yandex.ru>