This OmniFaces partial view context extends and improves the standard partial view context as follows:
Support for executing callback scripts by
PartialResponseWriter.startEval().
Support for adding arguments to ajax response.
Buffers the response until
ExternalContext.getResponseBufferSize() regardless of
ResponseWriter.flush() calls (which defaults to
javax.faces.FACELETS_BUFFER_SIZE).
Resettable buffer so that exceptions during ajax rendering can be properly handled.
Fixes the no-feedback problem when
ViewExpiredException occurs during an ajax request on a restricted
page.