New IsThereAnyDeal Price Notification

Most of the processing for this is on the back-end.  I still need to add
a dropdown to the options where the user can select their pricing
region.  Also, this will return empty if no deal or historical low price
is found in their database.
Added price check to subscriptions

Also cleaned up changelog
Price tab regional settings in options

Also cleaned up defaults on some options.
account_total_spent currency symbol detection