Make sure the Stats objects are reused when possible
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refactor
- Dominant language
- C++
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Description
* Make `Stats` part of the `Column` object.
* In addition, there will be `Stats** viewstats` field on the `DataTable` object (same as now). The `viewstats` object will be not-null iff `rowindex` is not null.
* When querying a stat on a column, use `viewstats` if the DT is a view, or individual columns' stats objects otherwise.
* remove `Stats.stype` ?
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