increase Xss to 160k to accomodate latest 1.6 JVMs
patch by jbellis; reviewed by brandonwilliams for CASSANDRA-4602
Bump stack to 180k.
Patch by brandonwilliams reviewed by jbellis for CASSANDRA-4631
Multiple values for CurrentLocal Node ID

patch by slebresne; reviewed by jbellis for CASSANDRA-4626
Switch from NBHM to CHM in MessagingService's callback map
patch by Daniel Norberg; reviewed by jbellis for CASSANDRA-4708
fix CHANGES for #4708
Update version and news for 1.0.12
Fix deadlockin mutation state underconcurrent, CL > ONE writes to counters
backport of CASSANDRA-4578
fix 'help describe cluster' in cassandra-cli