Add paging capabilities to Result Grouping functionality
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                 Key: SOLR-2207
                 URL: https://issues.apache.org/jira/browse/SOLR-2207
             Project: Solr
          Issue Type: Improvement
            Reporter: Grant Ingersoll
            Priority: Minor


Would be great to have the following:
# Paging of docs within a group via start and offset parameters such that one 
can drill down into a group
# While I know we can't return a total count of all groups, it would be nice to 
know if there are more groups.  This could simply be done by asking for 1 more 
group than requested by the user.  If that group is non-empty, then set a flag 
indicating there are more groups.  Then, start and offset could also be applied 
to allow paging down the groups.  We should also think about how we can 
optimize this so that we can page very deep into the results without needing to 
increase the PQ size.

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