Search through tags too

The integrated search doesn't search through the tags
of the cliparts. Because of that, the search results
are quite poor.

At www.openclipart.org/cchost for example, most of the
clipart have a very short description, or no
descriptiopn at all, and because of that the user gets
1 to 3 relevant results, instead of 8 to 10.

Please make it search among tags, and not only in the
name and description of cliparts, this will increase
the search accuracy and wideness.

Thanks!