[issue1745] Backport of PEP 3102 "keyword-only arguments" to 2.6

[Eric Smith]

Eric Smith <eric at trueblade.com> added the comment:

The patch doesn't apply cleanly for me.  I can fix the non-clean patch,
but another error is that obj2ast_arguments doesn't call arguments()
with the correct parameters.  If I pass in NULL's for the new params,
all tests pass, but that just tells me it's not being tested thoroughly.

I'll spend some time looking at it, but if anyone else wants to look at
it, go ahead.

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