Health does not increase with STR/END/WIL

Health is correctly calculated only after initialization of NCGDMW, subsequent changes of STR/END/WIL does nothing.

My character stats:

Level	END	STR	WIL	HP
1	39	38	35	66
10	44	43	39	66
21	50	52	46	66

I think the cause is that healthAttributes is not preserved between saves and therefore recalculate in doHealth() is never true.

When I add the following code at the beginning of doHealth(), everything works.

for _, attr in ipairs({'strength','endurance','willpower'}) do
  if not healthAttributes[attr] then
    healthAttributes[attr] = Player.stats.attributes[attr]
  end
end

(OpenMW git changeset 964f288c138867a3e772dc1bee84afe6fb88ae92)