NMS: Add (back) offset.

The use case is primarily about supporting generic ?offset=5m independently
from now=2015-04-02T15:00:30. Two reasons for this:

1. It allows easy generic client-side code to get two slightly offset time
series.
2. It makes it possible to get the most recent data + an offset without
having to refer to set now=(clock) to real time.

Also: Untested, so its probably broken.

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