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

[Mark Dickinson]

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

Thanks again for reviewing, Benjamin.  nb_long renamed in r68651, merged 
to 3.0 (along with a few other long->int cleanups) in r68666.

There seems to be a consensus on deprecating PyNumber_Int.  I'll leave 
this open until that's taken care of.

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