Both files in this commit exhibit the wrong way to use temporary files.

For TEHistory.cpp, it uses tmpfile() which produces a file which has a
name that can be guessed.

For vmemo.cpp, it uses tmpname() which only creates a predictable string.

Both uses have been switched to using mkstemp() wrapped around umask(). This
produces a much less predictable file that also has guaranteed restrictive
permissions.

I went a little farther in vmemo because it calls out to the shell using
system to 'mv' the new file. That is kinda wasteful so I switched it to use
rename instead.

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