Support "Staff of the Magi" etc.
The function add_spells_mage_staff in cmd-obj.c needs to be given a wrapper (and need to check it works). Possibly should be part of do_cmd_use ?
The function add_spells_mage_staff in cmd-obj.c needs to be given a wrapper (and need to check it works). Possibly should be part of do_cmd_use ?