support consolidation for raw/json/csv output

[Dieterbe]

use case: client-side rendering. if I know I'm going to render an X-pixels wide graph, I could specify this to graphite and have graphite consolidate the data before submitting as raw/csv/json, saving considerable bandwith (and arguably there is some benefit in not having to implement the same in all different client side plotting libraries)

I tried to see if this already works, but it seems like it doesn't have any effect:

$ >  curl 'http://$host/render/?from=-10hour&until=now&target=cumulative(servers.dfvimeodfsproxy1.network.em1.rx_bit)&format=json&width=2' | jsonpp > out-cumul
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 14399    0 14399    0     0   269k      0 --:--:-- --:--:-- --:--:--  342k
$ > curl 'http://$host/render/?from=-10hour&until=now&target=servers.dfvimeodfsproxy1.network.em1.rx_bit&format=json&width=2' | jsonpp > out
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 14387    0 14387    0     0   363k      0 --:--:-- --:--:-- --:--:--  468k
$ >  diff out out-cumul
diff --git a/out b/out-cumul
index bc516bd..ebdb2ce 100644
--- a/out
+++ b/out-cumul
@@ -2402,6 +2402,6 @@
                 1360621920
             ]
         ], 
-        "target": "servers.dfvimeodfsproxy1.network.em1.rx_bit"
+        "target": "cumulative(servers.dfvimeodfsproxy1.network.em1.rx_bit)"
     }
 ]
$ >

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