Opened file prompts for save after no changes

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The "do we need to save" check is supposed to return false if an army has been opened and not edited, but Snowblizz is reporting that opening a file and then closing the army prompts to save it when no changes have been made.

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Can't recreate with opening an army and closing it, or with creating a new army and closing it without making changes. Needs a repeatable test case.

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Snowblizz reports that it ​isn't reproducible. Presumably some change had been made but was forgotten, giving the impression that unchanged army prompted for saving.

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Managed to re-create the issue while testing #176. May be a bug or may be because of an earlier exception putting the app in a bad state.

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Rebuild with r279 to stop the exception occurring seems to have stopped the problem occurring. Assuming it is related to other errors, since FrmMain_ArmyChanged method clears the command stack when the army is changed (e.g. a new army is created or an old one is loaded)

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Mark released changes as released

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Mark released fixes as released using radio values