** inhibit some call line evaluation on export
   :DATE:     2012-01-20
A buffer in which we want =foo= to be run when called interactively
from /any/ call line, but to only be run by a single call line on
export.  Ensure this works by executing this buffer to html while
tracking =foo-called.times= with =tail -f /tmp/foo-called.times=.

#+NAME: foo
#+BEGIN_SRC sh :var id="foo"
  echo "called by $id at $(date +%s.%N)" |tee -a /tmp/foo-called.times

This will *not* be run on export.
#+call: foo[:eval no-export]("bar")

This *will* be run on export.
#+call: foo("baz")