About *at functions

[oblique]

I notice that a lot of *at functions are missing, however there are some unmerged PR which are also closed (see #562, #605, #751).

At #751 @Susurrus suggested AbsPath(&P), RelCurDir(&P), and RelTo(&P, &RawFd), however I believe it can be simplified to: Path(&P) and RelTo(RawFd, &P).

I'm willing to start adding *at functions, but I want to know if you agree with my simplified suggestion.

[Susurrus]

Why do you get rid of RelCurDir? How is it replaced by Path?

[oblique]

I want to get rid of AbsPath, not RelCurDir. User defines absolute path by having / at the beginning, otherwise it is relative. So Path handles both cases. I don't see what AbsPath can give us more.

[oblique]

How should I proceed on this?