Access to data from Java

The interfaces are actually divided in two groups : the ones providing read access to the data and the ones providing write access. The first ones have their name ending with ``Info'' while the second ones have their name ending with ``Editor''.

The data were split into three pieces : the event types, the replica catalog and the rest of the bookkeeping. Thus, there are 6 interfaces : IEvtTypeInfo, IReplicaInfo, IBookkeepingInfo, IEvtTypeEditor, IReplicaEditor and IBookkeepingEditor.

On top of the interface themselves, two helper classes were defined in the (tiny) Java part of Gaudi : StatusCode and Handle. They are the only objects returned by the methods of the interfaces.