remove unused imports throughout

...inspiral/bin/gstlal_compute_far_from_snr_chisq_histograms

gstlal-inspiral/bin/gstlal_inspiral

...l-inspiral/bin/gstlal_inspiral_add_dt_dphi_snr_ratio_pdfs

gstlal-inspiral/bin/gstlal_inspiral_bank_splitter

gstlal-inspiral/bin/gstlal_inspiral_calc_rank_pdfs

gstlal-inspiral/bin/gstlal_inspiral_calc_snr

gstlal-inspiral/bin/gstlal_inspiral_combine_injection_sets

...nspiral/bin/gstlal_inspiral_compute_dtdphideff_cov_matrix

gstlal-inspiral/bin/gstlal_inspiral_create_prior_diststats

gstlal-inspiral/bin/gstlal_inspiral_destagger_injections

gstlal-inspiral/bin/gstlal_inspiral_injection_snr

gstlal-inspiral/bin/gstlal_inspiral_lnlrcdf_signal

gstlal-inspiral/bin/gstlal_inspiral_make_mc_vtplot

gstlal-inspiral/bin/gstlal_inspiral_make_snr_pdf

gstlal-inspiral/bin/gstlal_inspiral_mass_model

gstlal-inspiral/bin/gstlal_inspiral_merge_and_reduce

gstlal-inspiral/bin/gstlal_inspiral_plot_background

gstlal-inspiral/bin/gstlal_inspiral_plot_banks

gstlal-inspiral/bin/gstlal_inspiral_plot_kernels

gstlal-inspiral/bin/gstlal_inspiral_plot_sensitivity