Custom ErrorPages transformed by XLST and wrapped in PageShell

[jonathanaustin]

At the moment, custom ErrorPages are transformed by the XSLT and wrapped in the page shell if they are not an instance of the default FatalErrorPage.

For projects that are developing a custom error page and dont want to do the full XSLT transform there should be a way to disable the transform.

This could be done by a runtime property or maybe using a marker interface such as ErrorPageTransform to indicate the transform is required.