Further improvements to write op count (will re-order existing articles)

Added 800px width mode, which forces a floating navbar
Improvements to automatic nav bar hiding
Increased feed timeouts to 12 seconds (from default 5)
RSS1 and 2 no longer set the "Updated" property (as no such information
is available)
Added Entry digest, similar to Feed's
Removed Updated from FeedMeta and EntryMeta (unused)