new files added and class="main" tag to control fonts

This contribution let's you easily list multiple products per row. Similar to
the Contribution Products List in Columns (http://addons.oscommerce.com/info/112)
but this contribution requires no modding. Just simply replace the desired listing
module in the includes/modules directory. The modules are all independent from
eachother.

* products_listing.php
Replaces the old behavior with multipe products per row in a standard infobox.
The infobox will hopefully satisfy the STS users =)

* new_products.php
Makes the module conform to the Products Listing settings and look.

* also_purchased_products.php
Makes the module conform to the Products Listing settings and look.

* featured.php
makes the module conform to the products listing settings and look.
[you need to install Featured Products contribution(http://addons.oscommerce.com/info/651 Featured Products v1.6.5#2 TiM-SE 22 Mar 2010 ) first and then overwrite it]


* best_sellers.php
makes the module conform to the products listing setting and look.
after you upload this file,
add define('FILENAME_BEST_SELLERS', 'best_sellers.php'); to include/filenames.php
add define('TABLE_HEADING_BEST_SELLERS', 'Best Sellers'); to include/languages/english/index.php
add to catalog/index.php

* specials_mod.php
add define('FILENAME_SPECIALS_MOD', 'specials_mod.php'); to include/filenames.php
add define('TABLE_HEADING_SPECIALS_PRODUCTS_MODULE','S pecial Products'); to include/languages/english/index.php
add to catalog/index.php


Upload All files to catalog/include/modules/
ALL 6 files have been tested on WAMP server with PHP 5.3.0
All 6 files have different settings under configuration => product listing => Number of products per row on X
(all database entry is being created automatically upon first load of any of the listing modules.)


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