Handle abort() properly in SSTableRewriter

Patch by marcuse; reviewed by jmckenzie for CASSANDRA-8320
Expose off-heap memory usage stats

patch by Benjamin Lerer; reviewed by Aleksey Yeschenko for
CASSANDRA-7897
Merge branch 'cassandra-2.0' into cassandra-2.1

Conflicts:
	CHANGES.txt
	src/java/org/apache/cassandra/io/sstable/SSTableReader.java
	src/java/org/apache/cassandra/tools/NodeCmd.java
	src/java/org/apache/cassandra/utils/IFilter.java
	src/java/org/apache/cassandra/utils/obs/IBitSet.java
Fixed typo

Patch by davedamoon; reviewed by marcuse for CASSANDRA-8395
Increase quarantine on replacement

Patch by brandonwilliams, reviewed by jasobrown for CASSANDRA-8260
Merge branch 'cassandra-2.0' into cassandra-2.1

Conflicts:
	CHANGES.txt
Ninja-add missing consistency levels to cqlsh
Merge branch 'cassandra-2.0' into cassandra-2.1
Fix undeclared throwable exception while executing 'nodetool netstats localhost'

Patch by Vishal Mehta and Carl Yeksigian, reviewed by Carl Yeksigian for
CASSANDRA-8122
Merge branch 'cassandra-2.0' into cassandra-2.1
Fix undeclared throwable exception while executing 'nodetool netstats localhost'

Patch by Vishal Mehta and Carl Yeksigian, reviewed by Carl Yeksigian for CASSANDRA-8122
Damnit, Carl
don't block SocketThread for MessagingService

Patch by yangwei, reviewed by brandonwilliams for CASSANDRA-8188
Merge branch 'cassandra-2.0' into cassandra-2.1
Improve error message when stress is having GC issues (ninja)
Make sure we release sstable references after anticompaction

Patch by marcuse; reviewed by yukim for CASSANDRA-8386
support new IncrementalPrepareMessage