gstlal_idq_trigger_gen: added bottle routes, http server to produce psds, added verbose output; gstlal_plot_channel_psd: plotting utility for psd xml files

- simplify segment list collection
- fix handling of unpopulated segment list types

gstlal_idq_trigger_gen: modified trigger output to add true duration of template (instead of max duration)

idq_multirate_datasource: added options to set quality & high pass cutoffs; gstlal_idq_trigger_gen: changed Q, quality, high pass cutoff to lower latency