Looks up the enumerated type nick for
value and writes it to
key, within this.
It is a programmer error to give a
key that isn't contained in the schema for this or is not
marked as an enumerated type, or for
value not to be a valid value for the named type.
After performing the write, accessing
key directly with get_string
will return the 'nick' associated with
a Settings object
a key, within this
an enumerated value
true, if the set succeeds