[Gtk-sharp-list] Fixing for delegate issue (crashes in Mono HEAD with MonoDevelop, F-Spot and others).

[Miguel de Icaza]

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Hey Mike,

   The following patch fixes the issues we had with delegates.  There
are a few things to talk about:

	* Should we change from uint to int for the return values
	  of these things, as they would not be otherwise CLS compliant?

	* Should we add a `Remove' to Idle/Timeout that calls
	  Source.Remove?  Just a convenience function?

Miguel.


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