more pre create-table property validation checks (compression, speculative retry)
patch by dbrosius reviewed by jbellis for cassandra 5693
replace assert+cast w/ checkedCast
Tracing cleanup
patch by Mikhail Mazursky; reviewed by jbellis for CASSANDRA-5625
Update debian packaging for 2.0
Patch by Blair Zajac, reviewed by brandonwilliams for CASSANDRA-5688
allow sstable2json on 2i CFs
patch by Michał Michalski; reviewed by jbellis for CASSANDRA-5694
Merge branch 'cassandra-1.2' into trunk
import
merge from 1.2