Python3 cffi bindings

[David Bremner]

Gaute Hope <eg at gaute.vetsj.com> writes:

>
> By the way, it does not seem that the API is very far from the
> previous python API. If it is close enough, perhaps it is possible to
> get away with a bug version bump in the bindings rather than creating
> a new package. I understand the need for a new package, but it would
> be nice if we could avoid the future confusion of two python binding
> packages (if at all possible).
>

I'm not in a good position to judge how similar the APIs are.  It does
seem like there are at least some breaking changes, and we usually try
to make things smooth for people upgrading by deprecating interfaces
before removing them completely. On the other hand our previous concern
for supporting python pre 3.6 (I think. Maybe 3.5?) seems less and less
worrying (except maybe for people using old CentOS like things).

d