Greatly improve feed discovery..
Greatly improve feed discovery..

- support relative paths
- support link tags with service.feed (like most blogspot blogs)
- support discovering of feeds from pages that don't follow any
  of the discovery specifications. we employ a strategy recommended
  by Mark Pilgrim... going through the anchor tags, searching for
  links that ending in .rdf, .rss, or .xml. We also prefer links
  that go to urls in the same host.
- more foolproof matching of feed urls

svn path=/trunk/kdepim/akregator/; revision=310883

lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi