I could have sworn I ran make check before pushing it.

Also remove OBE comment.

An object failing fetch that is waited upon by the ESI delivery code
would cause asserts finding an empty object. If waiting for an object,
check the status of the object and deliver zero bytes if failed.

Fixes: #1953

An object is delivered to the client, not to the backend.

Fixes #1979

Fixes issue reported by @carlosabalde in #1976

closes #1976

Minor simplifications.

(Confused ?  You won't be after next weeks episode of ...)

OCD-level memory-management stuff, and drop the two-stage setup.

This includes various ugly workarounds for some of the things I
hope to clean up with this change.

renovations of it.