Fixed hang problem with ht_ssh
Added support for CREATE/ALTER TABLE ... WITH <schema-file>
Fixed bytes/cells scanned metric computation
Added cells/bytes Returned & ScanYield and requestBacklog metrics to RS
Cleaned up merge scanners; Removed unnecessary virtual methods
Fixed EOF hang problem in ht_ssh
Fixed bug in cache hit rate metrics computation
Fixed alloc-dealloc-mismatch problem discovered by AddressSanitizer
Added CommandShell prefix completion and ~ expansion
Fixed read hang problem in ht_ssh
Disable slow query log by default
issue 1321: Fixed infinite loop problem in ht_ssh during connect
Updated for 0.9.8.3 release