Make LCS split compaction results over many directories

Patch by marcuse; reviewed by yukim for CASSANDRA-8329
Merge branch 'cassandra-2.0' into cassandra-2.1

Conflicts:
	CHANGES.txt
	src/java/org/apache/cassandra/db/Memtable.java
	src/java/org/apache/cassandra/db/compaction/CompactionTask.java
	src/java/org/apache/cassandra/io/util/DiskAwareRunnable.java
Better jamm 0.3.0 jar
Merge branch 'cassandra-2.1' of https://git-wip-us.apache.org/repos/asf/cassandra into cassandra-2.1
Validate size of indexed column values

patch by Sam Tunnicliffe; reviewed by Aleksey Yeschenko for
CASSANDRA-8280
Merge branch 'cassandra-2.0' into cassandra-2.1

Conflicts:
	CHANGES.txt
	src/java/org/apache/cassandra/cql3/CFDefinition.java
	src/java/org/apache/cassandra/cql3/ColumnNameBuilder.java
	src/java/org/apache/cassandra/cql3/statements/ModificationStatement.java
	src/java/org/apache/cassandra/cql3/statements/UpdateStatement.java
	src/java/org/apache/cassandra/db/index/SecondaryIndexManager.java