ox-ravel.org: Remove advicing. Simplify export functions.
ox-ravel.org: Remove advicing. Simplify export functions.

* org-ravel-wrap-parsers: macro takes the place of advice and builds
  in the code to make exporters run right under ravel.

* org-babel-expand-body:ravel: Now makes a proper pairlist for (:engine . ...)

* org-babel-execute:ravel: Get :engine from the pairlist just mentioned.

* org-ravel-export-to-file, org-ravel-export-string-as, and
  org-ravel-export-to-buffer are much neater.

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