tep_get_path optimization

for osCommerce Online Merchant v2.2

If you ever added Output Queries Debug (http://www.oscommerce.com/community/contributions,2575) to your site you will have noticed a number of very similar queries getting the parent_id of categories on index.php where you have subcategories showing (two for each subcategory). Half of them are the same. They are all queries originating from the function tep_get_path. This mod will eliminate all of those queries.

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