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Python 3 / PEP3102 introduced keyword-only arguments, like in
def foo(a, *, b):
pass
where `b` can't be set as a positional argument. This can't be expressed in
tagger script, so reject calls to register such functions.
This also gets rid of a DeprecationWarning for inspect.getargspec.
Signed-off-by: Wieland Hoffmann <themineo@gmail.com>