Do movingAverage() after aggregation.
Before: sumSeries(movingAverage(target,x), movingAverage(target,x))
After: movingAverage(sumSeries(target, target2, target3))
Merge pull request #38 from zehome/fixavgover

Do movingAverage() after aggregation.

seems to work fine. tested it with normal queries, with 'avg over' and with 'unit=B/h', 'unit=B/M' etc.
cause right now there's 2 places where we use target_modifiers, for avg over and for unit conversion
(movingAverage and scale respectively)