Nightmare mudlib living lfun: add_skill()

int add_skill(string type, int level, int per_level)

This adds a new skill called "type" with a current level of "level" and a
per level value of "per_level".  If this skill already exists in the object, then
nothing happens and a 0 is returned.  A 1 is returned in the case of
success.

See also: query_all_skills(), set_skill()
Defined in /std/living/skills.c
