[issue19713] Deprecate various things in importlib thanks to PEP 451

[Nick Coghlan]

Nick Coghlan added the comment:

Keep in mind we figured out post-PEP acceptance that there are still a
couple of obscure use cases that need the old loader API, so we may want to
keep that around as a "power user" mode rather than deprecating it (either
forever or until a replacement is defined in 3.5)

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