Change in fillingpattern on longitudinal equilibrium

Now the property fillingpattern must be normalized to one and not to the total current. The current to be evaluated is the value in ring.total_current
total_voltage is now an optional argument of calc_synchrotron_frequency, if not inserted, the method will calculate with self.total_voltage
expose the options delete_m0and delete_m0k0 to the method calc_mode_coupling()
Add notebook to calculate PTBL to examples

lnls-fac / collective_effects