serology for follow up visits were not imported

Closes #335

See merge request NCER-PD/scheduling-system!254

Resolve "import of serology data"

Closes #336 and #335

See merge request NCER-PD/scheduling-system!253

Tns lab ids updated

See merge request NCER-PD/scheduling-system!252

added new locations lab-reunis-38 lab-ketterthill-39 lab-reunis-40 lab-ketterthill-41

See merge request NCER-PD/scheduling-system!251

Virus visit column changes

See merge request NCER-PD/scheduling-system!250

changed field label in subject visit info https://git-r3lab.uni.lu/NCER-PD/scheduling-system/-/issues/331\#note_46155

fixed issue with visit numbers in statistics https://git-r3lab.uni.lu/NCER-PD/scheduling-system/-/issues/333\#note_46157

more admin menus. I don't know other way to edit the columns that are visible except manually from psql

small description so that it is not counter intuitive to find first 1 and then 0 in the subject visits

undo change. see https://git-r3lab.uni.lu/NCER-PD/scheduling-system/-/merge_requests/250\#note_46014

More provenance  #328

See merge request NCER-PD/scheduling-system!249

in case of SHOW_VISITS_FROM_ZERO, we add another field to the serialization (we don't want to replace visit_number in case is used as such)