[Sage] Folders reflecting state of feeds

[João Miguel Neves]

Good afternoon,

Attached is a patch against HEAD for a feature I requested in the wiki.

Description: Folders have status updated if any of its subfolders of
feeds have state updated.

Why: I have too many feeds (as I believe most people have these days). I
have sorted them in categories (folders) and I like to keep the folders
closed. When I check for sources I'm able to see which folders are being
checked. What I want is that, after the check, I have a way to know
which folders have updated feeds.

Files affected: updatechecker.js and sage.css - the change in sage.xul
was just to allow me to test this.

Could one of the programmers review this for inclusion? I've never
worked with XUL before. The code is working as I expected, but one can
never tell...

Best regards,
						João Miguel Neves
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