Deletes metadata by meta ID.

Removes the thumbnail (featured image) from the given post.

Get boundary post relational link.

Get site index relational link.

Retrieves metadata by meta ID.

Get parent post relational link.

Retrieve user info by email.

Perform the query to get the $metavalues array(s) needed by _fill_user and _fill_many_users

Retrieve user info by login name.

Display relational link for the site index.