HBASE-7807 Introduce HRegionFileSystem and move region fs related code

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1451025 13f79535-47bb-0310-9956-ffa450edef68
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/trunk@1451037 13f79535-47bb-0310-9956-ffa450edef68