Taniwha: 30/1/95
      : added scloud/stinker   stinking cloud
      :      ccloud/confuse   cloud of confusion
      :      kcloud/ckiller   cloud kill

NOTE: These are QUEST spells, in particular no player should be able to
      learn more than one on stinking cloud or cloud of confusion

      : added tweaks.h for easy adjustment of spell cost/damage

