[dev] Agora: limiting requested threads, and getLastMessage

[Duck]

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With the usage of DataTree::sortByAttributes path I supplied today, I change 
Agora to slice the requested threads per page before creating the message 
objects. I imported 24.000 messages from a Phorum installation and without 
this patch it falls in max execution time, now it takes a few seconds. Still 
too much but is a step forward.

Duck

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