HBASE-7641 Port HBASE-6669 'Add BigDecimalColumnInterpreter for doing aggregations using AggregationClient' to trunk (Julian Wissman)



git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.95@1451038 13f79535-47bb-0310-9956-ffa450edef68
HBASE-7843 Enable encapsulating compaction policy/compactor/store file manager interaction shenanigans

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.95@1451079 13f79535-47bb-0310-9956-ffa450edef68