Unify different library-to-client callback mechanisms

http://subversion.tigris.org/issues/show_bug.cgi?id=2659




User dionisos changed the following:

                What    ld value 
               |New value
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        Target milestone|---                       |2.0
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------- Additional comments from dionisostigris.org Sat Nov 18 14:03:04 -0800 2006 -------
Set milestone.

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