Updates to Fast Adiabatic Pulse
Updates to Fast Adiabatic Pulse

- Include offset from sweet spot
- Replace dac_flux_coefficient by V_per_phi0
- lambda_2 and lambda_3 should now be given in units of lambda_1. This
ensures that the range of sensible values for lambda_2 and lambda_3 does
not depend on theta_f.

DiCarloLab-Delft/PycQED_py3,DiCarloLab-Delft/PycQED_py3,DiCarloLab-Delft/PycQED_py3,QudevETH/PycQED_py3