#25 Impossible to cancel unaccessible feed

[Victor Jalencas]

Sorry for the bad summary, the field is too short.
When trying to access certain feed (in my case, the
default W3C feed) and having network difficulties (or
some other, I have not debugged it yet) Aggie keeps
retrying forever (or, if there's a timeout, I haven't hit it yet)
and does not allow me to cancel the process so as to
be able to read the news or correct (in case it was
wrong) the URL of the feed.