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).
62fb875931