clean up tempfile module and rm FIXME

This removes the FIXME suggesting that mkdtemp should rely on the
default umask, because that would make it unusable for making a secure
work area in a world writable directory (have to assume that other users
have created files, directories, hard links, etc. in your directory).
The POSIX mkdtemp function creates a directory with 700 permissions to
avoid this problem.

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