Change 3 months graphs to 6 months graphs
As of yesterday (cf. #16513 (moved) and #24729 (moved)), we're retaining bandwidth and weights histories on 24 hour granularity for 6 months rather than just 3. In 3 months from today (May 2018) we can extend the 3 months graphs to 6 months graphs with a granularity of 24 hours per data point.
If we decide to do this, the "3_month" string will change to "6_month", and the object will contain twice as many values. We should make sure that Relay Search can handle this before we make this change.
Requires a minor protocol version change.
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