rewrite revert command. fix issues 93, 123, 147. new version does these things: - saves backup copies of modified files (issue 147) - prints output like other commands, and errors when files not found (issue 123) - marks files added/removed (issue 93)

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#header#

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    <title>#repo|escape#: tags </title>

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    <description>#repo|escape# tag history</description>

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    #entriesnotip%tagentry#

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  </channel>

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</rss>