patch that makes saveChanges optional on session destruction in zope

Sender: John Lenton <[email protected]>

This patch adds a boolean property to the ZEditingContextSessioning
zope product that controls whether saveChanges is called upon session
destruction. Defaults to true (i.e., do saveChanges).

It's a very simple patch, but it does what we needed (building a web
application that needs to ensure atomicity of a complex object that is
created in multiple stages).

  On the same front, we *might* be building a (very stupid) application
  server---rather a Modeling server---for this, to enable simple
  creation of multiple complex-object-that-is-created-in-multiple-stages.
  I prototyped a readonly version in a night, and I think they liked
  it :)

-- 
John Lenton ([email protected]) -- Random fortune:
Robar las ideas de una persona es plagio; robarlas de muchas es investigación.
		-- Ley de Felson. 


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