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Purge trailing whitespace #17
Trailing whitespace is seen in some projects as bad practice (e.g. the Linux kernel) and is hence explicitly forbidden; other projects see its removal as plain nit-picking. This PR is submitted in the hope that it is helpful, however if you don't see any need to remove such whitespace I'm happy if you close the PR as unmerged. I've also split up this PR into several commits so that you can cherry-pick the commits if you want to. If you want me to squash the commits into one commit, I can do that and will resubmit the PR.