Fix IRE with ORDER BY, treating all selections as fns

Patch by Tyler Hobbs; reviewed by Benjamin Lerer for CASSANDRA-8286
Fix multicolumn relation + COMPACT STORAGE issues

Patch by Tyler Hobbs; reviewed by Benjamin Lerer for CASSANDRA-8264
Ninja: fix check for duplicate cols in INSERT

This was caused by the changes for CASSANDRA-8178
Make LCS split compaction results over many directories

Patch by marcuse; reviewed by yukim for CASSANDRA-8329
Validate size of indexed column values

patch by Sam Tunnicliffe; reviewed by Aleksey Yeschenko for
CASSANDRA-8280
Ignore Paxos commits for truncated tables

patch by Sam Tunnicliffe; reviewed by Aleksey Yeschenko for
CASSANDRA-7538
Add DC-aware sequential repair

patch by Jimmy Mårdell; reviewed by yukim for CASSANDRA-8193
Backport CASSANDRA-7386
Expose off-heap memory usage stats

patch by Benjamin Lerer; reviewed by Aleksey Yeschenko for
CASSANDRA-7897
Increase quarantine on replacement

Patch by brandonwilliams, reviewed by jasobrown for CASSANDRA-8260
Ninja-add missing consistency levels to cqlsh