function create_tag_cloud ($url = '', $num = 100)
Create a tag cloud from word database. Word database is a table filled when you use Fast Search feature of qE.
$url = link each the tag cloud entries to this url, eg: 'search.php?q='.
$num = number of most popular words to display.
It will return a string of tag cloud, with most popular tags in bigger font size.
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