Add ability for gnuplot to display/send back errors

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abchk1234

Hi, While trying out GnuPlot, I faced following issue: * `gnuplot` was not correctly installed. However there was no error thrown. I looked in logs, even enabled _display_errors_, yet no output. * Finally I got `gnuplot` working and using `php write.php` from command line worked, but running it via web failed. Again, I got no output from script to let me know there was an error somewhere. Could errors from running `gnuplot` be passed back to the user, please?

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