* ob-core.el (org-babel-merge-params): Specifying the symbol 'attach`
or string "'attach" as the value of the `:dir' header now functions as
":dir (org-attach-dir nil t) :mkdirp t".
(org-babel-result-to-file): Optional TYPE argument accepts symbol
'attachment to fixup up paths under `(org-attach-dir)' and use the
link type "attachment:" when that is detected.
(org-babel-insert-result): Pass symbol `attachment' as TYPE to
`org-babel-result-to-file'.
* org-attach.el (org-attach-dir): Added autoload header to simplify
dependencies necessary to support this feature (called in
`org-babel-merge-params').
* test-ob.el (test-ob-core/dir-attach): Added unit test for the new
attach feature.
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