Potions of healing, extra healing, and lifesaved heal amount

Make potions of healing and extra healing more useful in the early
game, by upping the average amount of health restored.

Make amulet of life saving restore between 60 and 170 health,
depending on constitution. Previously life saving was the best way
to heal back up to full, even if you had thousands of hp.

doc/fixes3-7-0.txt

@@ -988,6 +988,8 @@ if an item-using monster zaps a wand of digging downward on a level that
 	doesn't allow holes but does allow pits, create a pit and trigger it
 no longer override the effect of a new moon by simply carring a lizard corpse
 make explosions burn monster's armor just like they do hero's armor
+make healing and extra healing better by upping the average amount healed
+lifesaving healing amount depends on the consitution
 
 
 Fixes to 3.7.0-x Problems that Were Exposed Via git Repository

src/end.c

@@ -903,6 +903,7 @@ static void
 savelife(int how)
 {
     int uhpmin;
+    int givehp = 50 + 10 * (ACURR(A_CON) / 2);
 
     /* life-drain/level-loss to experience level 0 kills without actually
        reducing ulevel below 1, but include this for bulletproofing */
@@ -911,9 +912,9 @@ savelife(int how)
     uhpmin = minuhpmax(10);
     if (u.uhpmax < uhpmin)
         setuhpmax(uhpmin);
-    u.uhp = u.uhpmax;
+    u.uhp = min(u.uhpmax, givehp);
     if (Upolyd) /* Unchanging, or death which bypasses losing hit points */
-        u.mh = u.mhmax;
+        u.mh = min(u.mhmax, givehp);
     if (u.uhunger < 500 || how == CHOKING) {
         init_uhunger();
     }

src/potion.c

@@ -1099,7 +1099,7 @@ static void
 peffect_healing(struct obj *otmp)
 {
     You_feel("better.");
-    healup(d(6 + 2 * bcsign(otmp), 4), !otmp->cursed ? 1 : 0,
+    healup(8 + d(4 + 2 * bcsign(otmp), 4), !otmp->cursed ? 1 : 0,
            !!otmp->blessed, !otmp->cursed);
     exercise(A_CON, TRUE);
 }
@@ -1108,7 +1108,7 @@ static void
 peffect_extra_healing(struct obj *otmp)
 {
     You_feel("much better.");
-    healup(d(6 + 2 * bcsign(otmp), 8),
+    healup(16 + d(4 + 2 * bcsign(otmp), 8),
            otmp->blessed ? 5 : !otmp->cursed ? 2 : 0, !otmp->cursed,
            TRUE);
     (void) make_hallucinated(0L, TRUE, 0L);