[ZODB-Dev] Get rid of zope.proxy dependency

[Jim Fulton]

We used zope.proxy to implement blob storages as storage proxies. It
seemed like a good idea at the time, but since then I've added a
mix-in class that I've used in a number of storage implementations.

Do we still need the proxy-based implementation class? If we do, then
I plan to at least switch to using a simple pure-python proxying
mechanism.  If no one speaks up in favor of keeping the proxying
support, I'll probably just drop it.

Jim

-- 
Jim Fulton