Fix mean cells and mean row size per sstable calculations
patch by Paulo Gaspar, jbellis, and Marcus Eriksson for CASSANDRA-6667
Merge branch 'cassandra-1.2' into cassandra-2.0
Compact hints after partial replay to clean out tombstones
patch by jbellis; reviewed by ayeschenko for CASSANDRA-6666
Merge branch 'cassandra-1.2' into cassandra-2.0
fix race in LeaveAndBootstrapTest
Merge branch 'cassandra-1.2' into cassandra-2.0