Trigger automatic redirection updates on GetImage and SourceValidate

[ville.syrjala at nokia.com]

This is the second attempt at fixing IncludeInferiors access with
automatically redirected children.

Did as Keith suggested and wrapped GetImage and SourceValidate. So far
I only verified that GetImage works. CopyArea is yet to be tested.

What about GetSpans? Should it be wrapped as well? Is it even used in
reality?