Renders an action into an href link. If 'ajaxp' is true (the
default), the link will be rendered in such a way that the action will
be invoked via AJAX, or will fall back to regular request if
JavaScript is not available. When the user clicks on the link, the
action will be called on the server.

'action' - may be a function (in which case 'render-link' will
automatically call 'make-action'), or a result of a call
to 'make-action'.
'name' - A string that will be presented to the user in the
link.
'ajaxp' - whether link is submitted via AJAX if JS is available (true
by default).
'id' - An id passed into HTML.
'class' - A class placed into HTML.