Create update RAVEN circular

This MR adds an additional type of update type, one updating with information of a coincidence. This would be needed if an external event comes in later than sending an initial alert (order of 1-2 hours) which could happen in certain cases (e.g. a subthreshold GRB comes in later than usual due to the longer analysis time).

ligo/followup_advocate/templates/RAVEN_circular.jinja2

 {% from 'macros.jinja2' import naturalfar, grbmission, propername %}
-{% include 'authors.jinja2' %}
+{% if not update_alert %}{% include 'authors.jinja2' %}
 
 {% include 'initial_body.jinja2' %}
 
+{% endif %}
 {% filter rewrap %}
 A search performed by the RAVEN pipeline found a temporal coincidence between
 {{gracedb_id}} and a {% if snews %}SNEWS supernova{% elif grb %}{% if subthreshold %}sub-threshold {% endif %}{{grbmission(external_pipeline)}}{% endif %} {{propername(external_trigger)}} **CITE ORIGINAL GCN FOR THE EXTERNAL TRIGGER FROM https://gcn.gsfc.nasa.gov/gcn3_archive.html, e.g., (Bhalerao et al., GCN Circular XXXXX)**.
 The {% if snews %}neutrino{% elif grb %}GRB{% endif %} trigger time is {{latency}} seconds {{beforeafter}} the GW candidate event.
 {% if grb %}
 The estimated joint false alarm rate for the time coincidence is {{naturalfar(time_coinc_far)}}.
-{% endif %}
 
-{% if group.lower() == 'cbc'  %}{%- include 'p_astro.jinja2' -%}
+{% endif %}
+{% if group.lower() == 'cbc' and not update_alert %}{%- include 'p_astro.jinja2' -%}
 
 {%- include 'em_bright.jinja2' -%}
-{% endif %}
 
-{% if combined_skymap is not defined %}
-{% include 'userguide_conclusion.jinja2'%}
-{% else %}
+{% endif %}
+{% if combined_skymap %}
 A combined sky map is also available:
  * {{combined_skymap}}, the normalized product of the GW and GRB localizations.
 
 For the {{combined_skymap}} sky map, the {{cl}}% credible region is {{combined_skymap_greedy_area|round|int}} deg2.
-{% if space_time_coinc_far is not none %}
+{% endif %}
+{% if combined_skymap and space_time_coinc_far is not none %}
 Considering the overlap of the individual sky maps, the estimated joint false alarm rate for the spatial and temporal coincidence is {{naturalfar(space_time_coinc_far)}}.
-{% else %}
+{% elif combined_skymap and space_time_coinc_far is none %}
 The spatial and temporal coincidence is not yet available.
 {% endif %}
 
+{% if not update_alert %}
 {% include 'userguide_conclusion.jinja2'%}
 {% endif %}
+{% if combined_skymap and not update_alert %}
 {% include 'numbered_pipeline_citations.jinja2' %}
+{% endif %}
 {% endfilter %}