stale-ok view queries can return inconsistent partial results
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                 Key: COUCHDB-736
                 URL: https://issues.apache.org/jira/browse/COUCHDB-736
             Project: CouchDB
          Issue Type: Bug
    Affects Versions: 0.11
            Reporter: Chris Anderson


since r796805 requests to views with the stale=ok option have returned 
partially computed index results. This changed the semantics of views. This 
ticket is about maintaining the old semantics.

This should be changed so stale=ok only returns what would be returned by a 
normal view request. stale=partial would be an OK name for an option to provide 
the current behavior. 

The best way to fix this would be to store the NewGroup sent on the 
partial_update cast in #group_state.partial_group instead of #group_state.group

This will also eliminate the (rare) changes of serving inconsistent results 
with a regular view query.

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