* thread-view-skel:
view: show thread size when linking to summary
view: default to flat/hybrid thread display
view: fix up some HTML injection via Message-ID vectors
www: reinstate old thread view as an option
view: show more nearby messages in flat thread view
view: tweak thread/index header slightly
feed: add $INBOX/new.html endpoint
view: merge $state hash with existing $ctx
view: show thread context in the thread-aware flat view
www: use WwwStream for dumping thread and search views
www: implement hybrid flat+thread conversation view