O4a online dtdphi plotter

This patch allows the following dtdphi plot to be uploaded to gracedb page.
Example G-event pages:
MDC 3-ifo event (two dtdphi plots)
MDC 2-ifo event (one dtdphi plot)
MDC 1-ifo event (no dtdphi plot)

TODO:

• test with single triggers
• test with online small analysis
• try adding LV plot and see if that is informative any way

gstlal-inspiral/bin/Makefile.am

@@ -27,6 +27,7 @@ dist_bin_SCRIPTS = \
 	gstlal_inspiral_injection_template_match \
 	gstlal_inspiral_lnlrcdf_signal \
 	gstlal_inspiral_lvalert_background_plotter \
+	gstlal_inspiral_lvalert_dtdphi_plotter \
 	gstlal_inspiral_lvalert_generic_plot_uploader \
 	gstlal_inspiral_lvalert_omegascan \
 	gstlal_inspiral_lvalert_pastro_rate_posterior \