Let Org-mode babel file result support relative (adaptive) link type by using `org-link-file-path-type`.

This also can solve static site generator extensions (like `ob-blog.el` etc) image link path issue.

Also better if user changed parent directory name, those links will have to updated too. But if `adaptive` `org-link-file-path-type` will solve this problem.

So please let Org-mode babel header arguments `:results file :file "filename.png"` use `org-link-file-path-type` variable.

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