IMPORTANT: Upgrading to Amazon.com Associates Web Service 4.0

IMPORTANT: Upgrading to Amazon.com Associates Web Service 4.0

As announced this past February, Amazon.com will no longer be
accepting web services requests to Amazon E-Commerce Service
(Amazon ECS) version 3.0 beginning on March 31, 2008.

This patch upgrades to Amazon.com's Associates Web Service 4.0
for the following components:

1. Amazon.com Locale support for: Canada, Germany, France, Japan,
   UK, and US (see the new syspref called AmazonLocale)
2. Jacket Covers
3. Editorial Reviews
4. Customer Reviews
5. Amazon.com Similar Items

The following changes MUST be made to continue using Amazon.com
content:

1. Delete the system preference: AmazonDevKey (AmazonDevKeys used
   with AmazonECS 3.0 are no longer valid)
2. Add the system preferences: AmazonLocale, AWSAccessKeyID
   NOTE: steps 1, 2 are done by the web installer
3. Verify your AWSAccessKeyID:
   You may already have an Access Key ID. You can access your Access
   Key ID by going to http://aws.amazon.com, pointing to Your Web
   Services Account, then clicking View Access Key Identifiers.
   Depending on when you signed up for ECS 3.0, you may need to
   re-register for an AWS account, which includes an Access Key ID.
4. Enter your AWSAccessKeyID in the Koha syspref called
AWSAccessKeyID

For complete details on the changes in Amazon.com Associates Web
Service 4.0, and the migration process, please see: http://tinyurl.com/ysorqy

Other changes with this patch:
 * added $tabsysprefs{PatronsPerPage}="Patrons";
 * Moved OPAC Features to OPAC in sysprefs
 * removed experimental OPACXISBNAmazonSimilarItems and XISBNAmazonSimilarItems features

Signed-off-by: Joshua Ferraro <jmf@liblime.com>