[MonoDevelop] filtering the GAC references in the edit references dialog

[John Luke]

Hey,
	I have been toying around with TreeModelFilter and thought something
like this would be useful.  It currently has an odd bug when pressing
cancel that causes a nullref (that does not happen in a standalone
example).  I thought I would post this and see if anyone has any
thoughts on how something like this should work on a UI level in
particular.
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