Add infunnel wrapper, simplify code generation

[efiring]

Wrapping the infunnel function, with its int return, required enough change that I took the opportunity to re-write some of the code generation functions.

[ocefpaf]

I want to run the code generation steps in the CIs in the future but we don't need to wait for that to merge this one.

[efiring]

You already have one CI run for code generation--do you mean run code generation for every build on every combination of versions and platforms? I'm not convinced that would be a good idea.

[ocefpaf]

You already have one CI run for code generation--do you mean run code generation for every build on every combination of versions and platforms? I'm not convinced that would be a good idea.

Nope. I forgot I already did that :-/
Sorry but lately my brain doesn't seem to be able to hold new information anymore.

[ocefpaf]

@efiring are you OK with a new release? I can do that later today/tomorrow.

[efiring]

Yes, a release would be fine, thank you.