cqlsh: fix COPY FROM handling of null/empty PK values

Patch by Tyler Hobbs; reviewed by Aleksey Yeschenko for CASSANDRA-7792
Improve PasswordAuthenticator default super user setup

patch by Aleksey Yeschenko; reviewed by Jeremiah Jordan for
CASSANDRA-7788
Merge branch 'cassandra-1.2' into cassandra-2.0

Conflicts:
	CHANGES.txt
Merge branch 'cassandra-2.0' into cassandra-2.1.0
Validate empty cell names from counter updates

patch by Aleksey Yeschenko; reviewed by Jeremiah Jordan for
CASSANDRA-7798
Merge branch 'cassandra-1.2' into cassandra-2.0

Conflicts:
	CHANGES.txt
	src/java/org/apache/cassandra/cql3/Constants.java
Merge branch 'cassandra-2.0' into cassandra-2.1.0

Conflicts:
	CHANGES.txt
	src/java/org/apache/cassandra/cql3/Constants.java
	src/java/org/apache/cassandra/cql3/UpdateParameters.java
Throw EOFException if we run out of chunks in compressed file

Patch by marcuse; reviewed by yukim for CASSANDRA-7664.
Merge branch 'cassandra-2.0' into cassandra-2.1.0

Conflicts:
	CHANGES.txt
Stop inheriting liveRatio and liveRatioComputedAt from previous memtables

patch by Aleksey Yeschenko; reviewed by Jonathan Ellis for CASSANDRA-7796
Merge branch 'cassandra-2.0' into cassandra-2.1.0

Conflicts:
	CHANGES.txt
	src/java/org/apache/cassandra/db/DataTracker.java
	src/java/org/apache/cassandra/db/Memtable.java
Make StreamReceiveTask thread safe and gc friendly

patch by yukim; reviewed by benedict for CASSANDRA-7795
Merge branch 'cassandra-2.0' into cassandra-2.1.0

Conflicts:
	CHANGES.txt
	src/java/org/apache/cassandra/streaming/StreamReceiveTask.java
Fix ReversedType.isCompatibleWith()

Patch by Tyler Hobbs; reviewed by Sylvain Lebresne for CASSANDRA-7797
Merge branch 'cassandra-2.0' into cassandra-2.1.0

Conflicts:
	CHANGES.txt
	test/unit/org/apache/cassandra/cql3/TypeTest.java
Configure system.paxos with LeveledCompactionStrategy
patch by Sankalp Kohli; reviewed by jbellis for CASSANDRA-7753
Merge branch 'cassandra-2.0' into cassandra-2.1.0
(Hadoop) fix cluster initialisation for a split fetching

patch by Jacek Lewandowski; reviewed by Alex Liu for CASSANDRA-7774
Merge branch 'cassandra-2.0' into cassandra-2.1.0
cqlsh: preserve original result column names

Patch by Tyler Hobbs; reviewed by Aleksey Yeschenko for CASSANDRA-7806