SET&QUERY - key.c

set_key_data(s): This sets the type and the code of the key. These must be the
                 same as the lock. They should be seperated by a space.
                 Example: set_key_data("iron jen");
set_type(s): This is used to set the type alone.
             Example: set_type("iron");
set_code(s): And this is the same function for the code.
             Example: set_code("jen");
query_type(): This returns the type of the key.
query_code(): This returns the code of the key.
