Add tracing to min/max column name sstable elimination (see CASSANDRA-5514).

Patch by marcuse, reviewed by jbellis for CASSANDRA-5595
Add get commands for compaction/streaming throughput to nodetool.
Patch by Michal Michalski, reviewed by brandonwilliams for
CASSANDRA-5588
Merge branch 'cassandra-1.2' into trunk

Conflicts:
	src/java/org/apache/cassandra/tools/NodeCmd.java
	src/resources/org/apache/cassandra/tools/NodeToolHelp.yaml
fix parameter order in error message for #5596
Merge branch 'cassandra-1.2' into trunk
Work in progress - CREATE INDEX statement
Work in progress - CREATE KEYSPACE and CREATE COLUMNFAMILY statement
Work in progress - DROP INDEX statement
Work in progress - DROP KEYSPACE statement
Work in progress - DROP COLUMNFAMILY statement
Fix CREATE INDEX statement
Autocompletion in cqlsh - WIP (problem with DROP INDEX which completes too much words)
Testcase