I adjusted the OAL tool to regenerate all indicators, also change the manual
indicators and test mockers.
In the parent class, I added the following methods
```
public abstract Indicator toHour();
public abstract Indicator toDay();
public abstract Indicator toMonth();
```
By using this, indicator can be transferred to another new indicator in
hour/day/month dimensionalities.
The high-level dimensionality timer can aggregate indicators in minutes, and
save these.
[ Full content available at:
https://github.com/apache/incubator-skywalking/pull/1664 ]
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