Affiliate links 1.2

Affiliate links v1.2 changes:

Affiliate information is now added through a Affiliate links admin page. If upgrading from a previous version, please copy the information in the Affiliate links options page before upgrading. The options page is removed in v1.2.

Affiliate links v1.1 changes:

Now replaces any existing affiliate ID if there is one that is different to the one specified in the options page.