Updated Paypal accepted currencies

According to https://developer.paypal.com/webapps/developer/docs/classic/api/currency_codes/#paypal
Replaces PR #815 Shipping files fixes

Replaces PR #815, which fixes #683, #793, #803, #865, #870. There were
too many changes to deal with, so I decided it was faster to start from
scratch.
Merge pull request #890 from JeffPyeBrook/pr-visitor-meta

Check for tables existing even if database version is correct
Clear customer meta on clear auth cookie.
Clear customer meta on clear auth cookie, properly
Unset customer cookie properly.
Merge pull request #867 from misulicus/patch-10

Updated Paypal accepted currencies
Merge pull request #815 from ReactorShop/master

PR for issues #803, #683 (Shipping files fix)
Add 'wpsc_gateway_name' filter.
Remove Google Checkout from wpsc_gateway_name filter.
Inline documentation for wpsc_gateway_name().
Merge pull request #891 from benhuson/_wpsc_gateway_name_filter_2

Add 'wpsc_gateway_name' filter (rebased)
Merge pull request #892 from JeffPyeBrook/pr-visitor-meta

Profile expiration and bot detection enhancements
Add filter to get_all() method in WPSC_Country.
Merge branch 'master' of github.com:wp-e-commerce/WP-e-Commerce
Fix typo in minor version check.
This may be potentially back compat breaking for any developers who have remove_action()'d this for some reason.  Hard to imagine why that might have been done, but this would break it. Easy to fix, thankfully.  This change is courtesy of @ReactorShop.
PR for issue #894

As indicated in #894, these are the files fixes/modifications.
PR for #896

Solves #896, using http://en.wikipedia.org/wiki/List_of_postal_codes

I knew I was missing something regarding the PRs
Merge pull request #897 from ReactorShop/master

PR for #896