#234 Subscribe links in multi-calendar views

[Michael Zajac]

"Subscribe" links to the .ics files should be shown next to each calendar's
name in the Legend box. It would be nice if these links were displayed as
the common ical icons, as found on Apple's calendar-sharing site
<http://www.apple.com/macosx/features/ical/library/>.

Currently, this feature is well hidden. To subscribe to a calendar, a user
must jump to a single-calendar view for its subscribe link to show up on
the page.