RELEASE NOTES v0.8
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Changes
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 * added facility for specifying PayPal currency codes
 
 * yak_install is now called only once, on plugin activation
 
 * initial work adding filtering to orders page (at the moment, just showing fulfilled and unfulfilled orders)
 
Bug fixes
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 * change paypal pdt to use mc_gross rather than payment_gross as payment_gross is deprecated (yak code still checks for
   payment_gross field, if mc_gross isn't present for some reason)
   
 * fixed issue where posts weren't appearing on the products page even when the set default option was set
 
 * problem with default "now()" for tables.  This is not supported in older versions of MySQL
 
 * tidy up code, adding function_exists
 
 * problem with "Allowed memory size" on certain default installs of PHP.  The answer seems to be to add
   "ini_set" to the beginning of the script -- but not sure if this is the right solution.
   
 * products attached to pages (i.e. static content) were not clickable in the shopping cart (basically it
   would try to go to a post with that id, rather than a page)

 * shipping cost wasn't being included in the order value (function wp_yak_get_order_value)