Added some of the newer countries and fixes

Netherlands Antilles (AN) has been split in to new countries but has
been left in for compatibility with some shippers. Probably needs
removing in the future.

Canary Islands (IC) has been added despite not being a official code
only reserved. The 3 letter code ICA is not official or reserved. Canary
Islands (IC) is used by shippers and although part of Spain is not part
EU VAT region so can not be under ES.

Isle of Mann (IM), although a country, has been added under the United
Kingdom as it shares the EU VAT prefix GB and VAT numbers with the
United kingdom. It also shares postcodes and shippers treat as part of
GB. Probably needs adding as a county in the future and translating IM
to GB in the shipping modules and VAT validation.
fix for Language cache file is set differently by admin and customer sides
Merge pull request #273 from ADDCreative/patch28

Added some of the newer countries and fixes
Validation of database prefix at install
"Notice: Error: Table 'opencart.oc_filter_value_description' doesn't exist" fixed
"Notice: Error: Unknown column 'language_id' in 'where clause'" fixed
Merge pull request #276 from hkulekci/opencart

"Notice: Error: Table 'opencart.oc_filter_value_description' doesn't exi...
Merge pull request #275 from devtsit/patch-6

Validation of database prefix at install
fixed the a problem when adding new languages and filters
fix for On fresh install creates db table oc_coupon_category instead of DBPREFIX_coupon_category
starting the customer field system.

also changed the css for a the admin menu. i think the new colour looks nice.
renamed the files from customer_field to custom_field
fix for Undefined index: payment_address
Update upload/admin/language/english/setting/setting.php

Port, not Post
Merge pull request #279 from andrejuseu/patch-2

Update upload/admin/language/english/setting/setting.php
added an customer history system
Merge branch 'master' of https://github.com/opencart/opencart
fix for Customer/affiliate registration form country selection
some minor changes then reverted back
Per Item Shipping charges for products marked as not requiring shipping