Fixes and cleanups to hgeditor: - "HG: merge resolve" isn't supported for a long time now. - detection of unchanged commit message if signing is turned off. - don't add manifest hash to commit message if not signing.

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header = header-rss.tmpl

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changelog = changelog-rss.tmpl

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changelogentry = changelogentry-rss.tmpl

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filelog = filelog-rss.tmpl

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filelogentry = filelogentry-rss.tmpl