[ZODB-Dev] Read conflicts.

[Chris McDonough]

For reasons I've only lately been able to fathom, the Connection class 
raises a ConflictError in its setstate method.  This is a "read" 
conflict error and indicates that the data we're reading has been 
changed in another connection.

I'd like to be able to tell read conflicts apart from write conflicts 
for debugging and statistical purposes.  To do so, I'd like to add a 
ReadConflictError to POSException which subclasses ConflictError.  Does 
anyone see a problem with me just going ahead and doing that and 
checking it in on the trunk?

-- 
Chris McDonough                    Zope Corporation
http://www.zope.org             http://www.zope.com
"Killing hundreds of birds with thousands of stones"