Also dropped shameful use of PY_MINOR_VERSION.

    ag -l Copyright | xargs sed -i \
        "s/\(.*copyright (C) [0-9]\+\)\(-[0-9]\+\)\?\(.*\)/\1-$(date +%Y)\3/I"

One of them was actually wrong: lobject_type.c wouldn't have compiled
pre 8.3 (broken in 6e841a41, 2 years ago).

At PostgreSQL 10.0 it would have become awkward.

These functions don't need to exist: exposing the type in the module is
enough. It is actually better as one may use isinstance and such.

The default repr is enough: it prints <TypeName at 0xADDR> instead of
<TypeName object at 0xADDR>.

The only people being hurt by this change are the ones using doctests:
they deserve it.