Virus visit column changes

I deployed the changes in prc-test but browsing https://prc-test.parkinson.lu/subjects raises an ajax error (414 uri too large). I don't get this error locally. I tried to increase the buffers in nginx but nothing makes it work.

This is not as a result of these changes. I tried to deploy a previous commit and got the same error.

@valentin.groues can you check prc-test machine and try to fix it? @piotr.gawron is this a known issue?

Changes:

• Change Visit 1 virus to Visit 0 RT-PCR
• Change Visit X virus to count from 0
• Filter for inconclusive
• Change rest of Visit number references in the table

smash/web/templatetags/filters.py

 # See: http://stackoverflow.com/a/18962481
 from django import template
+from django.conf import settings
 from django.forms import CheckboxSelectMultiple, CheckboxInput
 from django.utils.safestring import mark_safe
 import datetime
@@ -46,3 +47,11 @@ def render_appointments(statistics, appointment_type):
 def timestamp(value):
     epoch = datetime.datetime.utcfromtimestamp(0)
     return (value.replace(tzinfo=None) - epoch).total_seconds()
+
+
+@register.filter(name='display_visit_number')
+def display_visit_number(visit_number):
+    if getattr(settings, "SHOW_VISITS_FROM_ZERO", False):
+        return (visit_number - 1)
+    else:
+        return visit_number
\ No newline at end of file