[Zope-CMF] Portal BTree Folder alpha available

[Dan L. Pierson]

We need a Members folder that can handle thousands of members with 
reasonable
performance so I've merged Shane's BTreeFolder with PortalFolder.  The first
version is now uploaded to the dogbowl with a news item to announce it. 
Y'all
should be able to see it as soon as it gets reviewed.

Now for the request for help :-)  I had to cut and paste a lot more of the
BTreeFolder code than I wanted to -- essentially all of it.  Otherwise the
folder appeared to work but failed to use btree storage or the UI.  It seems
that there's something I don't understand about multiple inheritance in 
Zope.
I'd appreciate any advice on how to make the implementation lighter weight.

Dan Pierson