Test insert ops -- not completed
Merge branch 'master' into test_ins_ops
Use cursor to get generated Ops instead of storing all in memory
(still needs extra optimisation for the random picking not in memory)
small improvements and added comment
Rename thisnumOps to limit when retrieve[ing]_operations()
Added how to determine the Readahead value
Added script to tail logfile from the last restart
Added script to tail logfile from the last restart