Write aafilter coefficients to file

lisainstrument/instrument.py

@@ -1926,6 +1926,7 @@ class Instrument:
             'initial_telemetry_size', 'telemetry_downsampling', 'telemetry_fs',
             'telemetry_dt', 'telemetry_size', 'telemetry_t0',
             'physics_upsampling', 'physics_size', 'physics_dt', 'physics_fs',
+            'aafilter_coeffs',
             'central_freq', 'lock_config', 'lock',
             'fplan_file', 'fplan',
             'laser_asds', 'modulation_asds', 'modulation_freqs',