Make the potion of healing much more common and easier to identify

At present, potions of healing generate primarily in Gehennom,
which causes significant balance issues (e.g. you don't have them
to heal in the early game, or even if you do, you can't identify
them in time to use them). In this series of commits, I'm aiming to
make potions of healing a more viable early-game healing source,
which means making them both (much) more likely to generate, and
easier to identify so that they are actually usable in the early
game.

This commit radically increases the generation chance of potions
of healing (reducing the chance of most other potions slightly to
compensate), and gives them a unique base price. This should make
them fairly easy to identify either by price-ID or quantity-ID
(and the unique base price is chosen to be fairly easy to figure
out even for unspoiled players).

doc/fixes3-7-0.txt

@@ -1299,7 +1299,7 @@ Wizards no longer have a bonus to writing unknown spellbooks, but now
 starting inventory: magic markers are more likely (guaranteed for
 	Wizards), but have fewer charges
 early dungeon (pre-Sokoban) generates extra useful survivability items
-
+potion of healing is much more common, and has a unique price
 
 
 Fixes to 3.7.0-x General Problems Exposed Via git Repository

include/objects.h

@@ -1098,59 +1098,59 @@ FOOD("tin",                  75,  0, 10, 1, METAL,   0, HI_METAL, TIN),
     OBJECT(OBJ(name, desc),                                             \
            BITS(0, 1, 0, 0, mgc, 0, 0, 0, 0, 0, 0, P_NONE, GLASS),      \
            power, POTION_CLASS, prob, 0, 20, cost, 0, 0, 0, 0, 10, color, sn)
-POTION("gain ability",           "ruby",  1, 0, 42, 300, CLR_RED,
+POTION("gain ability",           "ruby",  1, 0, 40, 300, CLR_RED,
                                                         POT_GAIN_ABILITY),
 POTION("restore ability",        "pink",  1, 0, 40, 100, CLR_BRIGHT_MAGENTA,
                                                         POT_RESTORE_ABILITY),
-POTION("confusion",            "orange",  1, CONFUSION, 42, 100, CLR_ORANGE,
+POTION("confusion",            "orange",  1, CONFUSION, 40, 100, CLR_ORANGE,
                                                         POT_CONFUSION),
-POTION("blindness",            "yellow",  1, BLINDED, 40, 150, CLR_YELLOW,
+POTION("blindness",            "yellow",  1, BLINDED, 30, 150, CLR_YELLOW,
                                                         POT_BLINDNESS),
-POTION("paralysis",           "emerald",  1, 0, 42, 300, CLR_BRIGHT_GREEN,
+POTION("paralysis",           "emerald",  1, 0, 40, 300, CLR_BRIGHT_GREEN,
                                                         POT_PARALYSIS),
-POTION("speed",            "dark green",  1, FAST, 42, 200, CLR_GREEN,
+POTION("speed",            "dark green",  1, FAST, 40, 200, CLR_GREEN,
                                                         POT_SPEED),
-POTION("levitation",             "cyan",  1, LEVITATION, 42, 200, CLR_CYAN,
+POTION("levitation",             "cyan",  1, LEVITATION, 40, 200, CLR_CYAN,
                                                         POT_LEVITATION),
-POTION("hallucination",      "sky blue",  1, HALLUC, 40, 100, CLR_CYAN,
+POTION("hallucination",      "sky blue",  1, HALLUC, 30, 100, CLR_CYAN,
                                                         POT_HALLUCINATION),
 POTION("invisibility", "brilliant blue",  1, INVIS, 40, 150, CLR_BRIGHT_BLUE,
                                                         POT_INVISIBILITY),
-POTION("see invisible",       "magenta",  1, SEE_INVIS, 42, 50, CLR_MAGENTA,
+POTION("see invisible",       "magenta",  1, SEE_INVIS, 40, 50, CLR_MAGENTA,
                                                         POT_SEE_INVISIBLE),
-POTION("healing",          "purple-red",  1, 0, 57, 100, CLR_MAGENTA,
+POTION("healing",          "purple-red",  1, 0, 115, 20, CLR_MAGENTA,
                                                         POT_HEALING),
-POTION("extra healing",          "puce",  1, 0, 47, 100, CLR_RED,
+POTION("extra healing",          "puce",  1, 0, 45, 100, CLR_RED,
                                                         POT_EXTRA_HEALING),
 POTION("gain level",            "milky",  1, 0, 20, 300, CLR_WHITE,
                                                         POT_GAIN_LEVEL),
 POTION("enlightenment",        "swirly",  1, 0, 20, 200, CLR_BROWN,
                                                         POT_ENLIGHTENMENT),
 POTION("monster detection",    "bubbly",  1, 0, 40, 150, CLR_WHITE,
                                                         POT_MONSTER_DETECTION),
-POTION("object detection",      "smoky",  1, 0, 42, 150, CLR_GRAY,
+POTION("object detection",      "smoky",  1, 0, 40, 150, CLR_GRAY,
                                                         POT_OBJECT_DETECTION),
-POTION("gain energy",          "cloudy",  1, 0, 42, 150, CLR_WHITE,
+POTION("gain energy",          "cloudy",  1, 0, 40, 150, CLR_WHITE,
                                                         POT_GAIN_ENERGY),
-POTION("sleeping",       "effervescent",  1, 0, 42, 100, CLR_GRAY,
+POTION("sleeping",       "effervescent",  1, 0, 40, 100, CLR_GRAY,
                                                         POT_SLEEPING),
 POTION("full healing",          "black",  1, 0, 10, 200, CLR_BLACK,
                                                         POT_FULL_HEALING),
 POTION("polymorph",            "golden",  1, 0, 10, 200, CLR_YELLOW,
                                                         POT_POLYMORPH),
-POTION("booze",                 "brown",  0, 0, 42,  50, CLR_BROWN,
+POTION("booze",                 "brown",  0, 0, 40,  50, CLR_BROWN,
                                                         POT_BOOZE),
-POTION("sickness",              "fizzy",  0, 0, 42,  50, CLR_CYAN,
+POTION("sickness",              "fizzy",  0, 0, 40,  50, CLR_CYAN,
                                                         POT_SICKNESS),
-POTION("fruit juice",            "dark",  0, 0, 42,  50, CLR_BLACK,
+POTION("fruit juice",            "dark",  0, 0, 40,  50, CLR_BLACK,
                                                         POT_FRUIT_JUICE),
 POTION("acid",                  "white",  0, 0, 10, 250, CLR_WHITE,
                                                         POT_ACID),
 POTION("oil",                   "murky",  0, 0, 30, 250, CLR_BROWN,
                                                         POT_OIL),
 /* fixed description
  */
-POTION("water",                 "clear",  0, 0, 92, 100, CLR_CYAN,
+POTION("water",                 "clear",  0, 0, 80, 100, CLR_CYAN,
                                                         POT_WATER),
 #undef POTION