Strengthen Poison

In its current state, Poison has such a minor effect that it may as well not even exist.
If HP is getting low - drink a Potion.  Done!
Antidotes have zero value and you may as well just sell them all and by potions.

Change '[Monster] cast spell Poison on [Player]' to '[Monster] inflicts Poison on [Player]'.

Dispel points need to be set far away from Merchants (selling Antidotes) and Safe points.