[dev] Agora usability patch

[Duck]

Message and flat view had nearly the same functionality. The only difference 
was that the flat view shows bodies, and flat view didn't allow the to 
directly post a replay. I combined the two to not have a code duplication, 
and allow posting a replay directly in flat view. The thread_view_bodies 
preference is extended to allow not just thread or flat view, but event flat 
view with indents.

Other changes:
- Produce a query less by allowing replyMessage() to accept an message array 
already retrieved in thread view.
- add pager in thread view
- add pref option to sort threads by number of posts
- allow to post a message directly even from flat view
- Fix sql syntax in agora_forum::search()
- Fix page titles in message view
- Don't even load identities if avantars are disabled in message view

Files to remove:
- templates/message_template.html
- messages/message.php

Files to add
- templates/messages/flat.html
- templates/messages/flat_thread.html

Duck
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