Fit global epistasis models

• Lib-1_2022-10-22_thaw-1_VSVG_control_1_vs_2022-10-22_thaw-1_no-antibody_control_1

• Lib-2_2022-10-22_thaw-1_VSVG_control_1_vs_2022-10-22_thaw-1_no-antibody_control_1

• Lib-1_2022-10-22_thaw-2_VSVG_control_1_vs_2022-10-22_thaw-2_no-antibody_control_1

• Lib-2_2022-10-22_thaw-2_VSVG_control_1_vs_2022-10-22_thaw-2_no-antibody_control_1