Bug Fix - custom named db object

PROBLEM:
Passing a custom ez_sql object name to constructor doesn't work - for example:
$ezr = new ez_results('custom_dbname');

SOLUTION:
Replace instances of: $db
With: ${$this->ez_sql_object}
On lines 186, 217, and 606 of ez_results.php

I guess I'll try to figure out the CVS system and maybe check in some of these fixes.