function defined by `quickurl-format-function'. Before only the
text of the URL was passed. Now the whole URL structure is passed
and the function is responsible for extracting the parts it
requires. Changed the default of `quickurl-format-function'
accordingly.
(quickurl-insert): Changed the `funcall' of
`quickurl-format-function' to match the above change.
(quickurl-list-insert): Changed the `url' case so that it makes
use of `quickurl-format-function', previous to this the format was
hard wired.
