nutritution consumption/starvation tweaks

Being polymorphed into a creature capable of eating metal objects
was treated as if the hero didn't/couldn't eat.  Treat it the same
as being able to eat ordinary food instead.

Being fainted or unconscious from other than sleep both ran
metabolism at full rate, unlike being asleep which skips per-turn
consumption 9 times out of 10 (but retains periodic ring/amulet
and hunger/regeneration/conflict consumption).  Switch to 'Unaware'
to handle sleep, unconsciousness other than sleep, and fainted
from lack of food as one metabolic condition.  Being paralyzed
isn't included but maybe should be.

Changing how metabolism operates when fainted changes the amount
of time until starvation occurs, so I adjusted that by an arbitrary
amount.  It will probably need tuning.  As things stand, you'll
still faint umpteen times before starving, bringing about lots of
frustration since the player can't do much during that time.

doc/fixes36.1

@@ -234,6 +234,10 @@ effects of cursed potion of levitation were skipped if already levitating
 when engulfed, having swallower be killed by angry deity trying to zap hero
 	no longer violates pacifist conduct (other penalties--reduced luck or
 	alignment--still apply if target is something you shouldn't kill)
+metabolism adjustments: hero poly'd into metallivore form still needs to eat;
+	being fainted or unconscious from other than sleep now consumes
+	nutrition at lower rate, like being asleep already did;
+	starvation threshold shortened due to slower food use while fainting
 
 
 Fixes to Post-3.6.0 Problems that Were Exposed Via git Respository