accept an IbisAttribute as a parameter, rather than its individual
fields.

On the client side, this requires that the IbisAttribute has a method
(encodedString()) to encode the attribute as a string (which the
matching valueOf(String) static method can decode on the server).

Not only is this a neater looking API, it also allows these methods
to work with binary data as well as textual data, without the need
for multi-part forms.

--
Imported using git-svn from
https://dev.csi.cam.ac.uk/svn/lookup/trunk@30