Replace im_func with __func__

[ale-rt]

Here:

Products.CMFCore/Products/CMFCore/indexing.py

Line 72 in bc815e2

return attr.im_func

[ale-rt]

I am unsure if doing a PR to fix this.
Apparently get_dispatcher is not used anywhere.
Can we just deprecate replace im_func with func and deprecate that method?

[dataflake]

@icemac assigned me here but I am not familiar with that code, I just forward-ported all that from a different branch back then. That function has no test coverage, either.

@ale-rt just go ahead and do it, including the deprecation warning. If there's problems people need to speak up, then we'll know.

[ale-rt]

Thanks! I just forgot this one

[dataflake]

@ale-rt I just couldn't stand seeing it on the list anymore 😉