hack for topitems block to work around permissions filtering

If you are using the topitems block to show the X latest articles, and you 
have some of those articles hidden from certain users (anonymous ones, in my 
case), you may notice that the block only shows the latest X articles  
*minus* the ones in that list that the user doesn't have permission to see.

The issue might not get a "real" fix for a while, so here is a hack:  Replace 
line 206 in modules/articles/xarblocks/topitems.php with:

    'numitems' => $vars['numitems'] * 2

and insert the following new code starting at line 210:

    for ($cnt = count($articles) - 1; $cnt >= $vars['numitems']; $cnt--) {
        unset($articles[$cnt]);
    }

This makes it select twice as many articles as are needed, and prunes the list 
down to the number of items you really wanted.  You will need to increase the 
multiplier on line 206 if more than half of the latest articles are 
restricted from certain users.

-Curtis