Added possibility to monitor performance in simulation with respect to geometry and...

Added possibility to monitor performance in simulation with respect to geometry and particle types. Simply add: sim.SetUseMonitoring(kTRUE) which will produce the file timing.root after simulation. Then use separately: AliTransportMonitor *mon = AliTransportMonitor::Import(timing.root); mon->Print(); mon->Print(ALIC); to inspect the monitored info. The tool collects the timing per particle at every step, correlated with the energy and type of the particle, aggregating the information per volume. This can run in any type of simulation (G3, G4, FLUKA)