Changes to Alchemist Class

Made several changes to the Alchemist class. The talent that allows the Alchemist to transmute one type of material to another just wasn't doing much. Unless you make it hard to find certain materials in your campaign, it was a sucky talent to get. I replaced it with +1 additional Alchemist Spell. I changed some of the wording and included limits to the amount of material you can include in a spell slot rather than infinite. (1-10 spell uses per slot). I also adjusted the number of spells per level, increasing them slightly. Some spells updated slightly.