Added tetanus
Made tetanus more dangerous
Vaccine
More tetanus chances, Flu vaccine
(CR) Flip TOUGH3/TOUGH HP modifiers

in player::normalize.

If ever there was something that looked Backwards, this was it.  It
wouldn't show up in debug-testing because switching traits calls
recalc_hp (which was coded correctly).
create iuse function for weed brownies
derp forgot the return
remove param name
Remove Vaccines for Separate
change from FOOD to MED
Defers to recalc_hp

Since this seems to only kick in for entering the tutorial and
generating NPCs, should be OK.
Merge remote-tracking branch 'dda/pr/7551' into dda-master

* dda/pr/7551:
  Remove Vaccines for Separate
  More tetanus chances, Flu vaccine
  Vaccine
  Made tetanus more dangerous
  Added tetanus

Conflicts:
	data/json/item_groups.json
	src/trapfunc.cpp
Merge remote-tracking branches 'dda/pr/7606' and 'dda/pr/7617' into dda-master

* dda/pr/7606:
  Defers to recalc_hp
  (CR) Flip TOUGH3/TOUGH HP modifiers

* dda/pr/7617:
  change from FOOD to MED
  remove param name
  derp forgot the return
  create iuse function for weed brownies