Merge branch 'BUG_FIX_estimate_elastic_scattering_threshold' into 0.7.1
Merge branch 'BUG_FIX_fourier_ratio_single_spectrum' into 0.7.1
Merge branch 'ENH_spikes_removal_tool_update' into 0.7.1
Merge branch 'BUG_FIX_second_pointer' into 0.7.1
Merge branch 'master' into 0.7.1