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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#!/bin/sh

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hg init

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echo "Is there an error message when trying to diff non-existing files?"

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hg diff not found

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echo "Is there an error message when trying to add non-existing files?"

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hg add not found