Remove left-over `org-define-obsolete-function-alias'
org-export: Change dispatcher keys and improve UI

* contrib/lisp/org-export.el (org-export-dispatch-ui,
org-export-dispatch-action): Set export options via control keys.  UI
changes.
Revert "Compatibility: Use org-define-obsolete-{function,variable}-alias"

This reverts commit 8fcdb5179bbe172b52dd80101efe247de9fe1ac2.
Merge branch 'master' of orgmode.org:org-mode