Remove underscores

[Saransh-cpp]

Closes #136

Underscores removed

• object_ -> object
• awkward_ -> awkward
• numpy_ -> numpy
• numba_ -> numba
• _backends -> backends

[Saransh-cpp]

Is there a file where I should add a warning for this? The issue mentions that the _backends package is being used outside of vector; would this be a breaking change?

[jpivarski]

The issue says that interfaces in the backends package could be used by third-party developers in the future, and _backends → backends makes it possible for them to start doing that. This API change adds a new publicly visible module, so it can't break any legitimate dependencies (only illegitimate ones that were directly looking inside of _backends), so it's safe.

However, it would be worthwhile checking inside backends to see if there's anything in there that would be bad to make public (i.e. to let people legitimately depend on the current interfaces).

[jpivarski]

All of the modules in backends that I could see make good use of leading underscores for private implementations, except for the numba and numba_object backends. So just make these

• backends/numba → backends/_numba
• backends/numba_objects → backends/_numba_objects

and that should be it. 100% of the Numba code is registering things in Numba itself: the variables and functions that are left around after doing that are of no interest to third-party developers and should be hidden so that we're free to change them.

[Saransh-cpp]

Thank you for the review! Yes, the numba part makes sense. I will update the underscores!