[Zope-CMF] GenericSetup improvements

[Florent Guillaume]

Here's a few things I'd like to change in GenericSetup's management  
of properties (PropertyManagerHelper):
- not export read-only properties,
- have an option for not exporting properties equal to their class  
default (I have code for this),
- not purge read-only properties,
- to purge properties, reset _properties to the class default (and of  
course remove impacted instance attributes), then additionnaly delete  
deletable properties (except title).

Also I'd like to change things like:
     node = property(_exportNode, _importNode)
into:
     def __exportNode(self):
         return self._exportNode()
     def __importNode(self, *args)
         self._importNode(*args)
     node = property(__exportNode, __importNode)
To allow proper subclass overriding and avoid the dead chicken of  
having to redefine the node property each time.

Opinions?

Florent

-- 
Florent Guillaume, Nuxeo (Paris, France)   Director of R&D
+33 1 40 33 71 59   http://nuxeo.com   fg at nuxeo.com