nightly lock files should use an invalid character as a separator
At present, the target of nightly's lock file links is separated by a '.'. That's a valid (somewhat questionably, admittedly) character in a hostname or nodename.
This is why sometimes nightly will tell you that it's already running, but get both the hostname and username of the person running it entirely incorrect. You have a '.' in what nightly thinks of as your hostname.
We could make nightly parse them from the RHS, and be immune to any problems this causes, but it'd be much easier (and probably smarter) to use a character which is not otherwise valid as a separator.
The only downside is that the old and new versions of nightly wouldn't lock eachother out.
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