LockFile.lock(): Two changes: first a minor one, if we raise a

TimeOutError, we want to unlink our tmpfname first, so we don't
potentially leave our linkfile hanging around forever.

The second change adds a `stolen' flag which gets set to 1 when we
determine a link is stale, and should eliminate the occasional assert
errors Ken is seeing.  My analysis is included in the comment in the
code, but I still wonder if the logic here isn't still flawed.

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