2010-03-27 Teodor Zlatanov <tzz@lifelogs.com>

 * auth-source.el (auth-sources): Change default to be simpler.  Explain
 about Secret Service API sources.  Improve Customize options.
 (auth-source-pick): Change to accept any number of search parameters.
 Implement fallbacks iteratively, not recursively.  Add scoring on the
 second pass and sort by score.  Call Secret Service API when needed.
 (auth-source-user-or-password): Use it.  Call Secret Service API
 directly when needed to get the user name and the password.