add check for sstable overlap within a level on startup
patch by jbellis; reviewed by Marcus Eriksson for CASSANDRA-5327
merge from 1.2
Nit: fix o.a.c.hadoop.ConfigHelper to return correct property on getThriftMaxMessageLength(Configuration)
merge from 1.1
remove more ipv6 colons from metric names
patch by Michał Michalski; reviewed by jbellis for CASSANDRA-5328
Merge branch 'cassandra-1.2' into trunk
Remove memory emergency pressure valve logic

patch by Aleksey Yeschenko; reviewed by Jonathan Ellis for
CASSANDRA-3534
ninja-kill DatabaseDescriptor.validateMemtableX() leftovers
Merge branch 'cassandra-1.1' into cassandra-1.2
Merge branch 'cassandra-1.2' into trunk
ninja-remove 'authority' from cassandra.yaml (deprecated in 1.2.0)
Fix cqlsh tests
Merge branch 'cassandra-1.2' into trunk
cqlsh: Fix COPY FROM value quoting and null handling

patch by Aleksey Yeschenko; reviewed by Brandon Williams for
CASSANDRA-5305
Merge branch 'cassandra-1.2' into trunk
Fix repair -pr for vnodes; patched by yukim reviewed by driftx for CASSANDRA-5329
Merge branch 'cassandra-1.2' into trunk
Add new GC Log Rotation options to cassandra-env.sh
patch by Jeremiah Jordan; reviewed by jbellis for CASSANDRA-5319
Merge branch 'cassandra-1.2' into trunk
Relax CL for auth queries for non-default users

patch by Aleksey Yeschenko; reviewed by Jonathan Ellis for
CASSANDRA-5310