nt <code>__nonrecursive__</code> attribute to the object.<P>

Python makes it possible to redefine getter/setter methods for attributes. 
Using this facility delegators for persistent object can be implemented. 
Instead of recursive loading of object cluster, it is possible to create delegators for the persistent
object and load objects on demand. Python API provides <code>PersistentDelegator</code>
class which catch method attribute access and load object from the database if needed. 
This class also redef