Added save plots.

...ions/lofar2/model/lofar2_station_sdp_firmware_model.ipynb

...lots/lofar2_station_sdp_firmware_model_incr_sigma_sys.jpg

...lots/lofar2_station_sdp_firmware_model_sst_db_si_bits.jpg

...r2/model/plots/signal_statistics_auto_correlator_mean.jpg

...lots/signal_statistics_auto_correlator_mean_power_std.jpg

...ar2/model/plots/signal_statistics_auto_correlator_snr.jpg

...2/model/plots/signal_statistics_cross_correlator_mean.jpg

...r2/model/plots/signal_statistics_cross_correlator_snr.jpg

...ons/lofar2/model/plots/signal_statistics_summator_snr.jpg

...ons/lofar2/model/plots/signal_statistics_summator_std.jpg

applications/lofar2/model/signal_statistics.ipynb