core: - history management improved

- better timestamp precision for history
bridge + core: history signature change (now return a list instead of a dict, and timestamp is now float)
quick_frontend: - use of new history API
				- removed deprecated keep_last argument in getHistory (was only used by Sortilège)

src/bridge/bridge_constructor/bridge_template.ini

@@ -438,14 +438,14 @@ async=
 type=method
 category=core
 sig_in=ssib
-sig_out=a{i(sss)}
+sig_out=a(dsss)
 param_3_default=True
 doc=Get history of a communication between two entities
 doc_param_0=from_jid: source JID (bare jid for catch all, full jid else)
 doc_param_1=to_jid: dest JID (bare jid for catch all, full jid else)
 doc_param_2=limit: max number of history elements to get (0 for the whole history)
 doc_param_3=between: True if we want history between the two jids (in both direction), False if we only want messages from from_jid to to_jid
-doc_return=Dict where key is timestamp (seconds this the Epoch), and value is a tuple (full from_jid, full to_jid, message)
+doc_return=Ordered list (by timestamp) of tuples (timestamp, full from_jid, full to_jid, message)
 
 [addContact]
 type=method