ctffind_plot_results.sh script

Hi,

On our Linux system, we found that the ctffind_plot_results.sh always give the same result.
Then found that /tmp/tmp.pdf is written by someone else and cannot be overwritten.

Probably it is better to modify the script as follows:

pdftk /tmp/tmp.pdf update_info /tmp/pdftemp.txt output $output_fn
rm /tmp/tmp.pdf # remove the temporary /tmp/tmp.pdf file.

Thanks.