#22 IGFXTaskAgent Enhancement

[Cinly Ooi]

IGFXInputTableTaskAgent should carry the following:
(1)getShell() : normally, a UI will need to be shown. If so, will need a shell
(2)performJob() should perhaps pass along the whole GFXDocumentModel. This will allow the everything about the document, pipeline included, to be saved if need be

[Cinly Ooi]

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Add also IStructureSelection, IWorkbench as in INewWizard.init(workbench, selection)