Fix high memory use due to tracking reads on incrementally opened sstable readers

Patch by Jake Luciani; reviewed by Jason Brown for (CASSANDRA-8066)
Merge branch 'cassandra-2.1' into trunk
Create backup directories for commitlog archiving during startup

patch by Jan Karlsson, reviewed by jasobrown for CASSANDRA-8111
Merge branch 'cassandra-2.0' into cassandra-2.1

Conflicts:
	CHANGES.txt
Merge branch 'cassandra-2.1' into trunk
ninja fix to add null check on CommitLogArchiver startup
Merge branch 'cassandra-2.0' into cassandra-2.1
Merge branch 'cassandra-2.1' into trunk
Remove fat client mode

Patch by brandonwilliams, reviewed by Joshua McKenzie for CASSANDRA-7820
remove empty static constructor
Fix autocompletion for alter keyspace

patch by Rajanarayanan Thottuvaikkatumana; reviewed by Mikhail Stepura for CASSANDRA-8021
Merge branch 'cassandra-2.0' into cassandra-2.1

Conflicts:
	CHANGES.txt
Merge branch 'cassandra-2.1' into trunk
Validate ascii and utf8 string literals in cql queries

Patch by Tyler Hobbs; review by Aleksey Yeschenko for CASSANDRA-8101
Merge branch 'cassandra-2.0' into cassandra-2.1

Conflicts:
	CHANGES.txt
	src/java/org/apache/cassandra/transport/CBUtil.java
Merge branch 'cassandra-2.1' into trunk