Streamline qc and op_handler macros

[marhel]

I'm thinking about modifying the qc-macro to have the same shape as the op_handler, so it's easier to copy-paste the op_handler-lines to produce a set of qc-tests.

Is that fine? I think it might create issues on the next PR based on the old qc-macro, but we'll just fix that then.

[emoon]

Sounds good!