implemented ``sys.cluster.settings`` expression
added parser support for `set global column = value`
implemented parser support for `RESET GLOBAL some_setting`
implemented sys.jobs in-memory table including collector
use UUID as job table key
access in memory tables directly instead of using a key
remove tableIdent from routing and isInMemory from TableInfo
add sys.jobs_log table
fix itest
implemented `sys.nodes.thread_pools` expressions
fix changes and use json representation in docs
add the sys.operations table
implemented set and reset statements
add sys.operations_log table
fix SetAnalysis.hasNoResults()
add possibility to enable/disable stats tables via cluster setting
document stats tables
try to keep old logs if the size of the q is changing
update changes
remove operations from "current" in all failure cases