revert and remove, filename case collision behavior

[Harvey Chapman]

Summary: 

1. Is "hg revert -a" supposed to give errors for filename case collision? I discovered that since it doesn’t, it makes for a nice way to clean up collisions on case-insensitive filesystems.
2. Also, hg remove acts a little odd when asked to remove a case collision filename. Examples below.
[ There would be an email here but the list server thinks it’s spam no matter how I send it and from where ]

The email:  https://gist.github.com/sr105/1b562519f7cafbf25a14

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