Fix duplicate registration of metatypes#414
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lohedges
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lohedges
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Backport fix from PR #414. [ci skip]
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This PR fixes duplicate converter registrations in the Python wrappers for OpenMM-related classes, which caused
RuntimeWarning: to-Python converter already registeredwarnings at import time. The autogeneration script (scanheaders.py) has also been updated to deduplicate metatypes so the issue does not recur when wrappers are regenerated.develinto this branch before issuing this pull request (e.g. by runninggit pull origin devel): [y]