Changes

* recall a checked out item * place a 'hold' on an item * request an item for delivery to a particular location (circ desk or other)

Where possible, you should not use the 'request' service, but should instead use a service expressing a more specific action availability. However, actually existing ILS's can make it very hard to figure out what more specific actions are available, and it may still be useful to advertise the ILS 'request' function, this service represents that.