[issue4910] Remove uses of nb_long slot, and rename to nb_reserved.

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

> I wonder if we should mark
> PyNumber_Long as deprecated in the docs, though.

It would be nice to standardize on one of (PyNumber_Long, PyNumber_Int) 
and document the other as deprecated.

Maybe it would make more sense to stick with PyNumber_Long and deprecate 
PyNumber_Int, though?  It would make 2.x -> 3.x transitions easier, and 
would be consistent with some of the rest of the API:  we seem to be 
using PyLong_Check in preference to PyInt_Check in current code...

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