From A.Agocs: Fixed integer overflow in mu calculation. The multiplication nB*orbits...

From A.Agocs: Fixed integer overflow in mu calculation. The multiplication nB*orbits in AliTriggerRunScalers::CalculateMu was truncated to 32 bits because the result type of the multiplication is the widest of its operand, which is UInt_t of the orbits variable, a 32 bit unsigned integer.  I found that this is not always enough to contain the result of the multiplication. Run 146805 from period LHC11a overflows the multiplication: nB = 47
orbits = 275952095
nb*orbits = 12969748465 = 3 * 2^32 + 84846577