Major improvements in the security of the CAPTCHA system (no SQL injection or anything like that); fixed denied form submission due to _af_acting on form object wrongly switched to true

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#!/bin/bash

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for f in *.svg; do

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    echo Converting $f

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    fname=`echo $f | cut -d '.' -f 1`

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    rm -f $fname.png

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    inkscape -z -f $f -w 22 -h 22 -e ./$fname.png

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done