Static Functions in Headers?

[insertinterestingnamehere]

I'm seeing various static functions defined in headers. Offhand this seems like a mistake since the primary reason for to make something static is to either produce a unique copy per translation unit and to restrict visibility to that translation unit. Symbol visibility appears to be completely ad-hoc at the moment, and these functions have no associated static state that would need to be duplicated. Perhaps inline was intended instead?

Various examples (for now) in:
https://github.com/sandialabs/qthreads/blob/main/src/affinity/shepcomp.h
https://github.com/sandialabs/qthreads/blob/main/src/affinity/shufflesheps.h

For now, to bypass warnings about unused static functions, I'm marking some of them as extern inline. If we switch the default symbol visibility to hidden (as suggested in #165) then we should be able to just mark them as inline.