New Charts!

Brought back the simulation over time tab that includes a single chart,
the cashier performance over time line chart, which contains the cashier
performance chart data over a series of simulations.

Added a new probability of new clients pie chart at the configuration
tab, which shows the probability of a new client be regular, priority,
manager or priority manager. The math behind the data was explained by
Rafael Wasilewski <wasilewski1991@gmail.com>.