Minor interface improvements, further tweaks to fancy sidebar behavior.

Sidebar sources now highlight currently-viewed feed.

fof_view_title() no longer lists '1 to n' when there are fewer items than the pagination limit.

Fancy sidebar view-links now link to unread view, if unread items exist; link to all-item view is now in menu.

Fixed links to unpaged views in sidebar nav, added unpaged link to item nav.