inotify: improve error messages
* prefix messages by inotify-(client|server)
* make sure that all warning and abort messages use the same format.
* in the case where inotify.sock is an old broken symlink, say so and abort
instead of trying to overwrite the already existing link
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crosschecking files in changesets and manifests
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checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
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dirstate
hgrc
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