adds delta index for tpcc
changed TPCC script to also log failed transactions, is displayed by benchmark.Plotter.printStatistics
better presentation of fail/success ratio
fixed signal handler for ctrl+c so only main process handles it
fixed bug where benchmark would continue after users stopped working
fixed plotter script
fixed response time frequency plots to be... better
fix to only display internal errors and not transactional errors
transactional errors should still be logged as failed transactions...
merge master