Cater for plugins which duplicate posts

[bobbingwide]

There are plugins which can be used to clone content within the site. The most popular is now called Yoast Duplicate Posts, plugin slug: duplicate-posts. When you clone a post using this plugin, all of the post meta data is cloned. This includes oik-clone's metadata. When the post is published, then cloned, rather than creating a new post on the target sites the original cloned post is updated.

Actual result: Subsequent cloning of a duplicated post will update the original post. Expected result: The duplicated post should be cloned to a new post.

Requirement

• Don't clone _oik_clone_ids when creating a duplicate post

Proposed solution

• Implement a filter function for duplicate_post_excludelist_filter to add _oik_clone_ids and oik_clone_dnc to the array.
• No point using wildcards.

[bobbingwide]

This might do the job in the mean time.